This is a list of wars fought by Romania since 1859: The United Principalities of Moldavia and Wallachia did not participate in any wars.
The Romanian United Principalities did not participate in any wars.
Co-belligerents Bulgarian volunteersSerb rebels of Bosnia 3,000 civilian casualties Romania entered: 10 July 1913 Co-belligerent Ottoman Empire Romania entered: 27 August 1916 Romania temporary exited: 9 December 1917 Romania re-entered: 10 November 1918 France Russia (1914–1917) Italy (1915–1918) Japan Romania (1916–1918) Serbia Belgium Greece (1917–1918) Portugal (1916–1918) Montenegro (1914–1916) China (1917–1918) Siam (1917–1918) Co-belligerents Emirate of Nejd and Hasa Idrisid Emirate of Asir (1915–1918) Nepal Brazil (1917–1918) Transcaucasian Democratic Federative Republic Democratic Republic of Armenia Monaco Cuba Panama Guatemala Nicaragua Costa Rica Haiti Honduras Supply only Liberia (1917–1918) Diplomatic only Peru Bolivia Uruguay Ecuador San Marino Active neutrality Norway Austria-Hungary Ottoman Empire Bulgaria (1915–1918) Emirate of Jabal Shammar Dervish state Sultanate of Darfur Senussi (1915–1917) Mountainous Republic of the Northern Caucasus (1917–1918) Kuban People's Republic (1918) Democratic Republic of Georgia (1918) Romania entered: 11 November 1918 Romania exited: 11 June 1919 Romania Czechoslovakia (1918–1919) Ukrainian People's Republic Hutsul Republic (1919) Komancza Republic Active neutrality Co-belligerents Czechoslovakia Kingdom of Serbs, Croats and Slovenes Active neutrality Soviet Russia Active neutrality Soviet Russia Active neutrality Soviet Union 22 miners dead23 miners gravely wounded30 miners lightly wounded 7 workers dead20 workers wounded Romania entered: 22 June 1941 Romania switched sides: 23 August 1944 Romania exited: 9 May 1945 Germany Italy (1940–1943) Japan Affiliate states Romania (1941–1944) Hungary (1941–1945) Bulgaria (1941–1944) Thailand (1942–1945) Co-belligerents Finland (1941–1944) Vichy France (1940–1944) Iran (1941) Iraq (1941) Active neutrality Soviet Union (1939–1940) Spanish State Denmark (1940–1945) Monaco United States (1941–1945) Soviet Union (1941–1945) France (1939–1940, 1944–1945) China Poland (1939) Denmark (1940) Norway (1940) Belgium (1940) Luxembourg (1940) Netherlands (1940) Greece (1940–1941) Kingdom of Yugoslavia (1941) Egypt (1940–1945) Nepal Cuba (1941–1945) Brazil (1942–1945) Mexico (1942–1945) Ethiopia (1942–1945) Portuguese Timor (1942–1945) Colombia (1943–1945) Co-belligerents Italy (1943–1945) Romania (1944–1945) Finland (1944–1945) Bulgaria (1944–1945) Mongolia (1939) Finland (1939–1940) Estonia (1940) Latvia (1940) Lithuania (1940) Romania (1940) Client state Tuvan People's Republic (1941–1944) Supply only Bahrain Haiti (1941–1945) Honduras (1941–1945) Dominican Republic (1941–1945) Nicaragua (1941–1945) Iraq (1942–1945) Bolivia (1943–1945) Liberia (1944–1945) Diplomatic only Oman Panama (1941–1945) Costa Rica (1941–1945) El Salvador (1941–1945) Guatemala (1941–1945) Iran (1943–1945) Governments in exile Poland (1939–1945) Norway (1940–1945) Belgium (1940–1944) Free France (1940–1944) Luxembourg (1940–1944) Netherlands (1940–1945) Greece (1941–1944) Yugoslavia (1941–1945) Czechoslovakia Korea Active neutrality Iceland French Morocco (1939–1940, 1942–1945) Tonga 64,000 civilians dead 469,000 Jews died in Holocaust 3,352 wounded Iraqi National Congress New Iraqi government Iraqi Kurdistan Supreme Command for Jihad and LiberationArmy of the Men of the Naqshbandi Order Sunni insurgents Shia insurgents For fighting between insurgent groups, see Civil war in Iraq (2006–07).