| 1359 | Moldavia west of the Prut | The Kingdom of Hungary → Moldavia | Bogdan I rebels against King Louis I of Hungary (1359); a royal charter of 2 February 1365 confiscates his Maramureș estates. |
| 1359 | southern Bukovina | The Kingdom of Hungary → Moldavia | Bogdan I rebels against King Louis I of Hungary (1359); a royal charter of 2 February 1365 confiscates his Maramureș estates. |
| 1359 | northern Bukovina | The Kingdom of Hungary → Moldavia | Bogdan I rebels against King Louis I of Hungary (1359); a royal charter of 2 February 1365 confiscates his Maramureș estates. |
| 1359 | the Herța region | The Kingdom of Hungary → Moldavia | Bogdan I rebels against King Louis I of Hungary (1359); a royal charter of 2 February 1365 confiscates his Maramureș estates. |
| 1359 | the Hotin region (north, now in Ukraine) | The Kingdom of Hungary → Moldavia | Bogdan I rebels against King Louis I of Hungary (1359); a royal charter of 2 February 1365 confiscates his Maramureș estates. |
| 1359 | the Hotin region (south, now in Moldova) | The Kingdom of Hungary → Moldavia | Bogdan I rebels against King Louis I of Hungary (1359); a royal charter of 2 February 1365 confiscates his Maramureș estates. |
| 1388 | northern Dobruja | The Despotate of Dobruja → Wallachia | Mircea takes part of Dobruja in 1388, by some accounts only the south-west and only briefly. |
| 1394 | northern Dobruja | Wallachia → The Ottoman Empire | Sultan Bayezid I drives Mircea out of Dobruja (1394). |
| 1404 | northern Dobruja | The Ottoman Empire → Wallachia | After 1402 Mircea retakes Dobruja and Silistra and holds them until his death in 1418. |
| 1404 | the Cadrilater (southern Dobruja) | The Ottoman Empire → Wallachia | After Ankara (1402), Mircea retakes Silistra and Dobruja by 1404 and holds them until his death in 1418. |
| 1419 | northern Dobruja | Wallachia → The Ottoman Empire | Mehmed I conquers Silistra and all of Dobruja in spring 1419; other works give 1417 or 1420. |
| 1419 | the Cadrilater (southern Dobruja) | Wallachia → The Ottoman Empire | Mehmed I retakes Silistra in spring 1419. |
| 1484 | southern Bessarabia (Izmail, Bolhrad) | Moldavia → The Ottoman Empire | The Ottomans take Chilia (15 July 1484) and make it a sancak; the rest of the south probably follows in 1538. |
| 1484 | eastern Budjak (Cetatea Albă) | Moldavia → The Ottoman Empire | Bayezid II takes Cetatea Albă, or Akkerman (4 August 1484); it becomes the seat of the sancak of Akkerman. |
| 1484 | south-eastern Bessarabia (now in Moldova) | Moldavia → The Ottoman Empire | Bayezid II takes Cetatea Albă, or Akkerman (4 August 1484); it becomes the seat of the sancak of Akkerman. |
| 1526 | Transylvania (south) | The Kingdom of Hungary → The Eastern Hungarian Kingdom | After Mohács (1526) the land passes to King John Szapolyai, whose crown Ferdinand of Habsburg contests. |
| 1526 | Transylvania (north) | The Kingdom of Hungary → The Eastern Hungarian Kingdom | After Mohács (1526) the land passes to King John Szapolyai, whose crown Ferdinand of Habsburg contests. |
| 1526 | Crișana (south) | The Kingdom of Hungary → The Eastern Hungarian Kingdom | After Mohács (1526) the land passes to King John Szapolyai, whose crown Ferdinand of Habsburg contests. |
| 1526 | Crișana and Maramureș (north) | The Kingdom of Hungary → The Eastern Hungarian Kingdom | After Mohács (1526) the land passes to King John Szapolyai, whose crown Ferdinand of Habsburg contests. |
| 1526 | the Banat plain | The Kingdom of Hungary → The Eastern Hungarian Kingdom | After Mohács (1526) the land passes to King John Szapolyai, whose crown Ferdinand of Habsburg contests. |
| 1526 | the Banat highlands | The Kingdom of Hungary → The Eastern Hungarian Kingdom | After Mohács (1526) the land passes to King John Szapolyai, whose crown Ferdinand of Habsburg contests. |
| 1551 | Transylvania (south) | The Eastern Hungarian Kingdom → The Habsburg Monarchy | Queen Isabella gives up the realm on her son's behalf to Ferdinand (Treaty of Weissenburg, today Alba Iulia, 19 July 1551), in exchange for duchies in Silesia; the Kolozsvár diet acknowledges King Ferdinand's rule (26 July 1551). |
| 1551 | Transylvania (north) | The Eastern Hungarian Kingdom → The Habsburg Monarchy | Queen Isabella gives up the realm on her son's behalf to Ferdinand (Treaty of Weissenburg, today Alba Iulia, 19 July 1551), in exchange for duchies in Silesia; the Kolozsvár diet acknowledges King Ferdinand's rule (26 July 1551). |
| 1551 | Crișana (south) | The Eastern Hungarian Kingdom → The Habsburg Monarchy | Queen Isabella gives up the realm on her son's behalf to Ferdinand (Treaty of Weissenburg, today Alba Iulia, 19 July 1551), in exchange for duchies in Silesia; the Kolozsvár diet acknowledges King Ferdinand's rule (26 July 1551). |
| 1551 | Crișana and Maramureș (north) | The Eastern Hungarian Kingdom → The Habsburg Monarchy | Queen Isabella gives up the realm on her son's behalf to Ferdinand (Treaty of Weissenburg, today Alba Iulia, 19 July 1551), in exchange for duchies in Silesia; the Kolozsvár diet acknowledges King Ferdinand's rule (26 July 1551). |
| 1551 | the Banat plain | The Eastern Hungarian Kingdom → The Habsburg Monarchy | Queen Isabella gives up the realm on her son's behalf to Ferdinand (Treaty of Weissenburg, today Alba Iulia, 19 July 1551), in exchange for duchies in Silesia; the Kolozsvár diet acknowledges King Ferdinand's rule (26 July 1551). |
| 1551 | the Banat highlands | The Eastern Hungarian Kingdom → The Habsburg Monarchy | Queen Isabella gives up the realm on her son's behalf to Ferdinand (Treaty of Weissenburg, today Alba Iulia, 19 July 1551), in exchange for duchies in Silesia; the Kolozsvár diet acknowledges King Ferdinand's rule (26 July 1551). |
| 1552 | Crișana (south) | The Habsburg Monarchy → The Ottoman Empire | In the 1552 campaign the Ottomans take Arad county and the lower Mureș. |
| 1552 | the Banat plain | The Habsburg Monarchy → The Ottoman Empire | The Ottomans take Timișoara (1552); the Banat plain becomes the Eyalet of Timișoara, a province ruled by a pasha. |
| 1552 | the Banat highlands | The Habsburg Monarchy → The Ottoman Empire | Lugos and Karánsebes fall to the Ottomans in the 1552 campaign. |
| 1554 | the Banat highlands | The Ottoman Empire → The Eastern Hungarian Kingdom | Suleiman hands Lugos and Karánsebes back to Péter Petrovics, a Szapolyai partisan (1554). |
| 1556 | Transylvania (south) | The Habsburg Monarchy → The Eastern Hungarian Kingdom | The Torda diet (1556) recalls Isabella and John Sigismund; the state is again tributary to the Porte. |
| 1556 | Transylvania (north) | The Habsburg Monarchy → The Eastern Hungarian Kingdom | The Torda diet (1556) recalls Isabella and John Sigismund; the state is again tributary to the Porte. |
| 1556 | Crișana and Maramureș (north) | The Habsburg Monarchy → The Eastern Hungarian Kingdom | The Torda diet (1556) recalls Isabella and John Sigismund; the state is again tributary to the Porte. |
| 1571 | Transylvania (south) | The Eastern Hungarian Kingdom → The Principality of Transylvania | Under the Treaty of Speyer (1570), ratified on 10 March 1571, John Sigismund becomes 'prince' of Transylvania. |
| 1571 | Transylvania (north) | The Eastern Hungarian Kingdom → The Principality of Transylvania | Under the Treaty of Speyer (1570), ratified on 10 March 1571, John Sigismund becomes 'prince' of Transylvania. |
| 1571 | Crișana and Maramureș (north) | The Eastern Hungarian Kingdom → The Principality of Transylvania | Under the Treaty of Speyer (1570), ratified on 10 March 1571, John Sigismund becomes 'prince' of Transylvania. |
| 1571 | the Banat highlands | The Eastern Hungarian Kingdom → The Principality of Transylvania | The Banate of Lugos and Karánsebes joins the Principality of Transylvania, although the Treaty of Speyer does not mention it. |
| 1601 | Transylvania (south) | The Principality of Transylvania → The Habsburg Monarchy | After Michael's death (August 1601) the country is held by General Basta's imperial army until 1604; the only break is Mózes Székely's rule (May–July 1603). Ottoman suzerainty returns with Stephen Bocskai (1605). |
| 1601 | Transylvania (north) | The Principality of Transylvania → The Habsburg Monarchy | After Michael's death (August 1601) the country is held by General Basta's imperial army until 1604; the only break is Mózes Székely's rule (May–July 1603). Ottoman suzerainty returns with Stephen Bocskai (1605). |
| 1601 | Crișana and Maramureș (north) | The Principality of Transylvania → The Habsburg Monarchy | After Michael's death (August 1601) the country is held by General Basta's imperial army until 1604; the only break is Mózes Székely's rule (May–July 1603). Ottoman suzerainty returns with Stephen Bocskai (1605). |
| 1601 | the Banat highlands | The Principality of Transylvania → The Habsburg Monarchy | After Michael's death (August 1601) the country is held by General Basta's imperial army until 1604; the only break is Mózes Székely's rule (May–July 1603). Ottoman suzerainty returns with Stephen Bocskai (1605). |
| 1605 | Transylvania (south) | The Habsburg Monarchy → The Principality of Transylvania | The principality governs itself under Ottoman suzerainty: its princes pay tribute to the Porte. |
| 1605 | Transylvania (north) | The Habsburg Monarchy → The Principality of Transylvania | The principality governs itself under Ottoman suzerainty: its princes pay tribute to the Porte. |
| 1605 | Crișana and Maramureș (north) | The Habsburg Monarchy → The Principality of Transylvania | The Partium counties (Kraszna, Közép-Szolnok, Kővár, Máramaros) belong to the Principality of Transylvania. |
| 1605 | the Banat highlands | The Habsburg Monarchy → The Principality of Transylvania | The Banate of Lugoj–Caransebeș is part of the Principality of Transylvania. |
| 1658 | the Banat highlands | The Principality of Transylvania → The Ottoman Empire | Prince Ákos Barcsai cedes Lugoj and Caransebeș to the Porte (1658); the Peaces of Vasvár (1664) and Karlowitz (1699) confirm it. |
| 1687 | Crișana (south) | The Ottoman Empire → The Habsburg Monarchy | Imperial troops take Arad (1687); the Peace of Karlowitz (1699) fixes the border with the Ottomans on the Mureș. |
| 1688 | Transylvania (south) | The Principality of Transylvania → The Habsburg Monarchy | By the Declaration of Făgăraș (9 May 1688) Transylvania passes to Leopold I; the Peace of Karlowitz (26 January 1699) confirms Habsburg rule. |
| 1688 | Transylvania (north) | The Principality of Transylvania → The Habsburg Monarchy | By the Declaration of Făgăraș (9 May 1688) Transylvania passes to Leopold I; the Peace of Karlowitz (26 January 1699) confirms Habsburg rule. |
| 1688 | Crișana and Maramureș (north) | The Principality of Transylvania → The Habsburg Monarchy | The counties become Habsburg with Transylvania (1688); Máramaros returns to Hungary in 1733, and Transylvania's government runs the Partium (Sălaj) from 1733 to 1848. |
| 1715 | the Hotin region (north, now in Ukraine) | Moldavia → The Ottoman Empire | The Ottomans take over Hotin fortress (1713), and the district becomes a raia (1715), a territory ruled directly by the Ottomans. |
| 1715 | the Hotin region (south, now in Moldova) | Moldavia → The Ottoman Empire | The Ottomans take over Hotin fortress (1713), and the district becomes a raia (1715), a territory ruled directly by the Ottomans. |
| 1718 | Oltenia | Wallachia → The Habsburg Monarchy | The Peace of Passarowitz (21 July 1718) gives Oltenia to the emperor; the Olt river becomes the border. |
| 1718 | the Banat plain | The Ottoman Empire → The Habsburg Monarchy | Timișoara surrenders to the imperial army (13 October 1716) and the Banat comes under imperial military administration; the Peace of Passarowitz (21 July 1718) cedes it to the emperor. |
| 1718 | the Banat highlands | The Ottoman Empire → The Habsburg Monarchy | Imperial troops conquer the Banat (1716), which comes under imperial military administration; the Peace of Passarowitz (21 July 1718) cedes it to the emperor. |
| 1739 | Oltenia | The Habsburg Monarchy → Wallachia | By the Peace of Belgrade (18 September 1739) the emperor returns Oltenia to the Porte, and it rejoins Wallachia. |
| 1775 | southern Bukovina | Moldavia → The Habsburg Monarchy | By the Convention of Constantinople (7 May 1775) the Porte cedes northern Moldavia, thereafter called Bukovina, to Austria. |
| 1775 | northern Bukovina | Moldavia → The Habsburg Monarchy | By the Convention of Constantinople (7 May 1775) the Porte cedes northern Moldavia, thereafter called Bukovina, to Austria. |
| 1812 | the Hotin region (north, now in Ukraine) | The Ottoman Empire → The Russian Empire | The Treaty of Bucharest (16/28 May 1812) cedes the land between the Prut and the Dniester to Russia. |
| 1812 | the Hotin region (south, now in Moldova) | The Ottoman Empire → The Russian Empire | The Treaty of Bucharest (16/28 May 1812) cedes the land between the Prut and the Dniester to Russia. |
| 1812 | Bessarabia (centre and north) | Moldavia → The Russian Empire | The Treaty of Bucharest (16/28 May 1812) cedes the land between the Prut and the Dniester to Russia. |
| 1812 | southern Bessarabia (Cahul) | Moldavia → The Russian Empire | The Treaty of Bucharest (16/28 May 1812) cedes the land between the Prut and the Dniester to Russia. |
| 1812 | southern Bessarabia (Izmail, Bolhrad) | The Ottoman Empire → The Russian Empire | The Treaty of Bucharest (16/28 May 1812) cedes the land between the Prut and the Dniester to Russia. |
| 1812 | eastern Budjak (Cetatea Albă) | The Ottoman Empire → The Russian Empire | The Treaty of Bucharest (1812) cedes the Budjak, with Akkerman and Kilia, to Russia. |
| 1812 | south-eastern Bessarabia (now in Moldova) | The Ottoman Empire → The Russian Empire | The Treaty of Bucharest (1812) cedes the Budjak, with Akkerman and Kilia, to Russia. |
| 1856 | southern Bessarabia (Cahul) | The Russian Empire → Moldavia | The Treaty of Paris (30 March 1856, arts 20–21) returns southern Bessarabia to Moldavia; the actual handover followed the Paris protocol of 6 January 1857 and took place in March 1857. |
| 1856 | southern Bessarabia (Izmail, Bolhrad) | The Russian Empire → Moldavia | The Treaty of Paris (30 March 1856, arts 20–21) returns southern Bessarabia to Moldavia; the actual handover followed the Paris protocol of 6 January 1857 and took place in March 1857. |
| 1859 | Moldavia west of the Prut | Moldavia → The United Principalities | Moldavia's assembly elects Alexandru Ioan Cuza prince (5/17 January 1859), under the Paris Convention of 7/19 August 1858. |
| 1859 | the Herța region | Moldavia → The United Principalities | Moldavia's assembly elects Alexandru Ioan Cuza prince (5/17 January 1859), under the Paris Convention of 7/19 August 1858. |
| 1859 | southern Bessarabia (Cahul) | Moldavia → The United Principalities | Moldavia's assembly elects Alexandru Ioan Cuza prince (5/17 January 1859), under the Paris Convention of 7/19 August 1858. |
| 1859 | southern Bessarabia (Izmail, Bolhrad) | Moldavia → The United Principalities | Moldavia's assembly elects Alexandru Ioan Cuza prince (5/17 January 1859), under the Paris Convention of 7/19 August 1858. |
| 1859 | Oltenia | Wallachia → The United Principalities | Wallachia's assembly elects Alexandru Ioan Cuza prince (24 January/5 February 1859); he has already been elected in Moldavia. |
| 1859 | Muntenia | Wallachia → The United Principalities | Wallachia's assembly elects Alexandru Ioan Cuza prince (24 January/5 February 1859); he has already been elected in Moldavia. |
| 1862 | Oltenia | The United Principalities → Romania | On 22 January/3 February 1862 a single government is formed, and on 24 January/5 February a single assembly for both principalities meets at Bucharest. |
| 1862 | Muntenia | The United Principalities → Romania | On 22 January/3 February 1862 a single government is formed, and on 24 January/5 February a single assembly for both principalities meets at Bucharest. |
| 1862 | Moldavia west of the Prut | The United Principalities → Romania | On 22 January/3 February 1862 a single government is formed, and on 24 January/5 February a single assembly for both principalities meets at Bucharest. |
| 1862 | the Herța region | The United Principalities → Romania | On 22 January/3 February 1862 a single government is formed, and on 24 January/5 February a single assembly for both principalities meets at Bucharest. |
| 1862 | southern Bessarabia (Cahul) | The United Principalities → Romania | On 22 January/3 February 1862 a single government is formed, and on 24 January/5 February a single assembly for both principalities meets at Bucharest. |
| 1862 | southern Bessarabia (Izmail, Bolhrad) | The United Principalities → Romania | On 22 January/3 February 1862 a single government is formed, and on 24 January/5 February a single assembly for both principalities meets at Bucharest. |
| 1867 | southern Bukovina | The Habsburg Monarchy → Austria-Hungary | The Austro-Hungarian Compromise (1867) splits the monarchy into two halves, and Bukovina stays in the Austrian one. |
| 1867 | northern Bukovina | The Habsburg Monarchy → Austria-Hungary | The Austro-Hungarian Compromise (1867) splits the monarchy into two halves, and Bukovina stays in the Austrian one. |
| 1867 | Crișana (south) | The Habsburg Monarchy → Austria-Hungary | The Austro-Hungarian Compromise (1867) splits the monarchy into two halves. The area is governed from Budapest, within the Kingdom of Hungary. |
| 1867 | Crișana and Maramureș (north) | The Habsburg Monarchy → Austria-Hungary | The Austro-Hungarian Compromise (1867) splits the monarchy into two halves. The area is governed from Budapest, within the Kingdom of Hungary. |
| 1867 | the Banat plain | The Habsburg Monarchy → Austria-Hungary | The Austro-Hungarian Compromise (1867) splits the monarchy into two halves. The area is governed from Budapest, within the Kingdom of Hungary. |
| 1867 | the Banat highlands | The Habsburg Monarchy → Austria-Hungary | The Austro-Hungarian Compromise (1867) splits the monarchy into two halves. The area is governed from Budapest, within the Kingdom of Hungary. |
| 1867 | Transylvania (south) | The Habsburg Monarchy → Austria-Hungary | The Cluj diet is dissolved (20 June 1867) and Transylvania comes under Hungarian government. Act XLIII of 1868 regulates the union. |
| 1867 | Transylvania (north) | The Habsburg Monarchy → Austria-Hungary | The Cluj diet is dissolved (20 June 1867) and Transylvania comes under Hungarian government. Act XLIII of 1868 regulates the union. |
| 1878 | southern Bessarabia (Cahul) | Romania → The Russian Empire | The Treaty of Berlin (13 July 1878, Art. XLV) obliges Romania to hand southern Bessarabia back to Russia. |
| 1878 | southern Bessarabia (Izmail, Bolhrad) | Romania → The Russian Empire | The Treaty of Berlin (13 July 1878, Art. XLV) obliges Romania to hand southern Bessarabia back to Russia. |
| 1878 | the Cadrilater (southern Dobruja) | The Ottoman Empire → Bulgaria | The Treaty of Berlin (13 July 1878, Arts. I–II) places Southern Dobruja in the new autonomous Principality of Bulgaria. |
| 1878 | northern Dobruja | The Ottoman Empire → Romania | The Treaty of Berlin (Art. XLVI) adds Northern Dobruja to Romania. The Romanian army enters on 14/26 November 1878. |
| 1913 | the Cadrilater (southern Dobruja) | Bulgaria → Romania | The Treaty of Bucharest (28 July/10 August 1913, Art. II) transfers Southern Dobruja from Bulgaria to Romania. |
| 1917 | the Hotin region (north, now in Ukraine) | The Russian Empire → The Moldavian Democratic Republic | The Sfatul Țării, Bessarabia's assembly, proclaims the Moldavian Democratic Republic within a federative Russia (2/15 December 1917). |
| 1917 | the Hotin region (south, now in Moldova) | The Russian Empire → The Moldavian Democratic Republic | The Sfatul Țării, Bessarabia's assembly, proclaims the Moldavian Democratic Republic within a federative Russia (2/15 December 1917). |
| 1917 | Bessarabia (centre and north) | The Russian Empire → The Moldavian Democratic Republic | The Sfatul Țării, Bessarabia's assembly, proclaims the Moldavian Democratic Republic within a federative Russia (2/15 December 1917). |
| 1917 | southern Bessarabia (Cahul) | The Russian Empire → The Moldavian Democratic Republic | The Sfatul Țării, Bessarabia's assembly, proclaims the Moldavian Democratic Republic within a federative Russia (2/15 December 1917). |
| 1917 | southern Bessarabia (Izmail, Bolhrad) | The Russian Empire → The Moldavian Democratic Republic | The Sfatul Țării, Bessarabia's assembly, proclaims the Moldavian Democratic Republic within a federative Russia (2/15 December 1917). |
| 1917 | eastern Budjak (Cetatea Albă) | The Russian Empire → The Moldavian Democratic Republic | The Sfatul Țării, Bessarabia's assembly, proclaims the Moldavian Democratic Republic within a federative Russia (2/15 December 1917). |
| 1917 | south-eastern Bessarabia (now in Moldova) | The Russian Empire → The Moldavian Democratic Republic | The Sfatul Țării, Bessarabia's assembly, proclaims the Moldavian Democratic Republic within a federative Russia (2/15 December 1917). |
| 1918 | the Hotin region (north, now in Ukraine) | The Moldavian Democratic Republic → Romania | The Sfatul Țării votes for Bessarabia's union with Romania (27 March/9 April 1918), by 86 votes out of 138. |
| 1918 | the Hotin region (south, now in Moldova) | The Moldavian Democratic Republic → Romania | The Sfatul Țării votes for Bessarabia's union with Romania (27 March/9 April 1918), by 86 votes out of 138. |
| 1918 | Bessarabia (centre and north) | The Moldavian Democratic Republic → Romania | The Sfatul Țării votes for Bessarabia's union with Romania (27 March/9 April 1918), by 86 votes out of 138. |
| 1918 | southern Bessarabia (Cahul) | The Moldavian Democratic Republic → Romania | The Sfatul Țării votes for Bessarabia's union with Romania (27 March/9 April 1918), by 86 votes out of 138. |
| 1918 | southern Bessarabia (Izmail, Bolhrad) | The Moldavian Democratic Republic → Romania | The Sfatul Țării votes for Bessarabia's union with Romania (27 March/9 April 1918), by 86 votes out of 138. |
| 1918 | eastern Budjak (Cetatea Albă) | The Moldavian Democratic Republic → Romania | The Sfatul Țării votes for Bessarabia's union with Romania (27 March/9 April 1918), by 86 votes out of 138. |
| 1918 | south-eastern Bessarabia (now in Moldova) | The Moldavian Democratic Republic → Romania | The Sfatul Țării votes for Bessarabia's union with Romania (27 March/9 April 1918), by 86 votes out of 138. |
| 1918 | Transylvania (south) | Austria-Hungary → Hungary | The Károlyi government takes power in Budapest (31 October 1918). |
| 1918 | Transylvania (north) | Austria-Hungary → Hungary | The Károlyi government takes power in Budapest (31 October 1918). From 8 December its commissioner Apáthy represents it at Cluj. |
| 1918 | Crișana (south) | Austria-Hungary → Hungary | The Károlyi government takes power in Budapest (31 October 1918). |
| 1918 | Crișana and Maramureș (north) | Austria-Hungary → Hungary | The Károlyi government takes power in Budapest (31 October 1918). |
| 1918 | the Banat plain | Austria-Hungary → Hungary | The Károlyi government takes power in Budapest (31 October 1918). The area stays in the Hungarian state but is occupied by the Serbian army from 17 November 1918, and from January 1919 also by French troops; the occupation does not change the state. |
| 1918 | the Banat highlands | Austria-Hungary → Hungary | The Károlyi government takes power in Budapest (31 October 1918). Romanians form councils at Lugoj and Caransebeș. The area stays in the Hungarian state but is occupied by Serbian, then French troops; the occupation does not change the state. |
| 1918 | southern Bukovina | Austria-Hungary → Romania | The General Congress of Bukovina votes for union with Romania (15/28 November 1918). |
| 1918 | northern Bukovina | Austria-Hungary → Romania | The General Congress of Bukovina votes for union with Romania (15/28 November 1918). |
| 1918 | Transylvania (south) | Hungary → Romania | From 2 December 1918 the Directing Council at Sibiu governs provisionally under the Alba Iulia resolution. The Romanian army is already south of the Mureș. |
| 1918 | Transylvania (north) | Hungary → Romania | The Romanian army enters Cluj on 23 or 24 December 1918. |
| 1919 | Crișana (south) | Hungary → Romania | The Romanian army enters southern Bihor on 20 April 1919 and Arad on 17 May; the Treaty of Trianon fixes the border. |
| 1919 | Crișana and Maramureș (north) | Hungary → Romania | The Romanian army enters Carei and Oradea in April 1919; the Treaty of Trianon (4 June 1920) fixes the border. |
| 1919 | the Banat highlands | Hungary → Romania | The Romanian army enters Lugoj on 22 July 1919; the Treaty of Trianon fixes the border. |
| 1919 | the Banat plain | Hungary → Romania | Romanian administration takes over Timișoara on 28 July 1919 and the army enters on 3 August; the Treaty of Trianon fixes the border. |
| 1940 | northern Bukovina | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies northern Bukovina. |
| 1940 | the Herța region | Romania → The Soviet Union | The Soviet note of 26 June 1940 does not name Herța. The attached map includes it, and Soviet troops occupy the district. |
| 1940 | the Hotin region (north, now in Ukraine) | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies Bessarabia. |
| 1940 | the Hotin region (south, now in Moldova) | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies Bessarabia. |
| 1940 | Bessarabia (centre and north) | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies Bessarabia. |
| 1940 | southern Bessarabia (Cahul) | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies Bessarabia. |
| 1940 | southern Bessarabia (Izmail, Bolhrad) | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies Bessarabia. |
| 1940 | eastern Budjak (Cetatea Albă) | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies Bessarabia. |
| 1940 | south-eastern Bessarabia (now in Moldova) | Romania → The Soviet Union | On 28 June 1940 the Romanian government accepts the Soviet ultimatum of 26 June; the Red Army occupies Bessarabia. |
| 1940 | Transylvania (north) | Romania → Hungary | In the Second Vienna Award (30 August 1940) Germany and Italy give Northern Transylvania to Hungary, which incorporates it by law on 2 October. |
| 1940 | Crișana and Maramureș (north) | Romania → Hungary | Under the Second Vienna Award (30 August 1940) the area passes to Hungary. |
| 1940 | the Cadrilater (southern Dobruja) | Romania → Bulgaria | In the Treaty of Craiova (7 September 1940) Romania cedes the Cadrilater to Bulgaria; the Paris Peace Treaty (1947) keeps that border. |
| 1941 | the Herța region | The Soviet Union → Romania | Retaken by force on 4 July 1941 and returned to Romanian administration. |
| 1941 | northern Bukovina | The Soviet Union → Romania | Romanian and German troops retake northern Bukovina in July 1941, and the province is reintegrated into Romania (Governorate of Bukovina). |
| 1941 | the Hotin region (north, now in Ukraine) | The Soviet Union → Romania | Romanian and German troops retake Bessarabia in July 1941, and the province is reintegrated into Romania (Governorate of Bessarabia). |
| 1941 | the Hotin region (south, now in Moldova) | The Soviet Union → Romania | Romanian and German troops retake Bessarabia in July 1941, and the province is reintegrated into Romania (Governorate of Bessarabia). |
| 1941 | Bessarabia (centre and north) | The Soviet Union → Romania | Romanian and German troops retake Bessarabia in July 1941, and the province is reintegrated into Romania (Governorate of Bessarabia). |
| 1941 | southern Bessarabia (Izmail, Bolhrad) | The Soviet Union → Romania | Romanian and German troops retake Bessarabia in July 1941, and the province is reintegrated into Romania (Governorate of Bessarabia). |
| 1941 | southern Bessarabia (Cahul) | The Soviet Union → Romania | Romanian and German troops retake Bessarabia in July 1941, and the province is reintegrated into Romania (Governorate of Bessarabia). |
| 1941 | eastern Budjak (Cetatea Albă) | The Soviet Union → Romania | Romanian and German troops retake Bessarabia in July 1941, and the province is reintegrated into Romania (Governorate of Bessarabia). |
| 1941 | south-eastern Bessarabia (now in Moldova) | The Soviet Union → Romania | Romanian and German troops retake Bessarabia in July 1941, and the province is reintegrated into Romania (Governorate of Bessarabia). |
| 1944 | northern Bukovina | Romania → The Soviet Union | The Red Army retakes northern Bukovina in March 1944 (Cernăuți, 29 March); the Paris Peace Treaty (1947, Art. 1) confirms the border. |
| 1944 | the Herța region | Romania → The Soviet Union | The Red Army retakes Herța on 31 March 1944; the Paris Peace Treaty (1947, Art. 1) confirms the border. |
| 1944 | the Hotin region (north, now in Ukraine) | Romania → The Soviet Union | The Red Army retakes the area in 1944; the Paris Peace Treaty (10 February 1947, Art. 1) confirms the Soviet–Romanian border. |
| 1944 | the Hotin region (south, now in Moldova) | Romania → The Soviet Union | The Red Army retakes the area in 1944; the Paris Peace Treaty (10 February 1947, Art. 1) confirms the Soviet–Romanian border. |
| 1944 | eastern Budjak (Cetatea Albă) | Romania → The Soviet Union | The Red Army retakes the area in 1944; the Paris Peace Treaty (10 February 1947, Art. 1) confirms the Soviet–Romanian border. |
| 1944 | south-eastern Bessarabia (now in Moldova) | Romania → The Soviet Union | The Red Army retakes the area in 1944; the Paris Peace Treaty (10 February 1947, Art. 1) confirms the Soviet–Romanian border. |
| 1944 | Bessarabia (centre and north) | Romania → The Soviet Union | The Red Army retakes the area in 1944; the Paris Peace Treaty (10 February 1947, Art. 1) confirms the Soviet–Romanian border. |
| 1944 | southern Bessarabia (Izmail, Bolhrad) | Romania → The Soviet Union | The Red Army retakes the area in 1944; the Paris Peace Treaty (10 February 1947, Art. 1) confirms the Soviet–Romanian border. |
| 1944 | southern Bessarabia (Cahul) | Romania → The Soviet Union | The Red Army retakes the area in 1944; the Paris Peace Treaty (10 February 1947, Art. 1) confirms the Soviet–Romanian border. |
| 1944 | Transylvania (north) | Hungary → Romania | Retaken by Soviet and Romanian troops in 1944. An occupation follows: in November 1944 the Soviet command expels the Romanian administration and lets it return only on 9 March 1945. The 1947 peace treaty annuls the Vienna Award. |
| 1944 | Crișana and Maramureș (north) | Hungary → Romania | Retaken by Soviet and Romanian troops in 1944. An occupation follows: in November 1944 the Soviet command expels the Romanian administration and lets it return only on 9 March 1945. The 1947 peace treaty annuls the Vienna Award. |
| 1991 | northern Bukovina | The Soviet Union → Ukraine | Ukraine declares independence on 24 August 1991, and the referendum of 1 December 1991 confirms it. |
| 1991 | the Herța region | The Soviet Union → Ukraine | Ukraine declares independence on 24 August 1991, and the referendum of 1 December 1991 confirms it. |
| 1991 | the Hotin region (north, now in Ukraine) | The Soviet Union → Ukraine | Ukraine declares independence on 24 August 1991, and the referendum of 1 December 1991 confirms it. Only the northern part of former Hotin county is in Ukraine; its south, with Briceni, Edineț and Ocnița, is in the Republic of Moldova. |
| 1991 | southern Bessarabia (Izmail, Bolhrad) | The Soviet Union → Ukraine | Ukraine declares independence on 24 August 1991, and the referendum of 1 December 1991 confirms it. |
| 1991 | eastern Budjak (Cetatea Albă) | The Soviet Union → Ukraine | Ukraine declares independence on 24 August 1991, and the referendum of 1 December 1991 confirms it. |
| 1991 | the Hotin region (south, now in Moldova) | The Soviet Union → The Republic of Moldova | The Republic of Moldova declares independence (27 August 1991). |
| 1991 | Bessarabia (centre and north) | The Soviet Union → The Republic of Moldova | The Republic of Moldova declares independence on 27 August 1991. |
| 1991 | southern Bessarabia (Cahul) | The Soviet Union → The Republic of Moldova | The Republic of Moldova declares independence on 27 August 1991. |
| 1991 | south-eastern Bessarabia (now in Moldova) | The Soviet Union → The Republic of Moldova | The Republic of Moldova declares independence (27 August 1991). |