List of wars involving Costa Rica

This is a list of wars involving the Republic of Costa Rica.

  Costa Rican military victory

  Costa Rican military defeat

  Indecisive or unclear outcome

  Ongoing conflict

Conflict	Combatant 1	Combatant 2	Results
Ochomogo War (1823)	Republicans	Imperialists	Republican victory The First Mexican Empire was already dissolved at the time, Republicans moved the capital from Cartago to San José.
League War (1835)	San José	Alajuela Cartago Heredia	San Jose's victory
Filibuster War (1855–1857)	Nicaragua Costa Rica Honduras Mosquito Coast Guatemala El Salvador United States	Filibusters	Victory William Walker's army is defeated and he is arrested by the American Navy
World War I (1918)	France United Kingdom Russia United States China Italy Japan Canada Australia New Zealand India South Africa Serbia Montenegro Romania Belgium Greece Portugal Brazil Costa Rica	Germany Austria-Hungary Ottoman Empire Bulgaria	Victory End of the German, Russian, Ottoman, and Austro-Hungarian empires Formation of new countries in Europe and the Middle East Transfer of German colonies and regions of the former Ottoman Empire to other powers Establishment of the League of Nations
Coto War (1921)	Costa Rica	Panama	Victory Panama ceded Coto to Costa Rica
World War II (1941–1945)	Soviet Union United States United Kingdom China France Poland Canada Australia New Zealand India South Africa Yugoslavia Greece Denmark Norway Netherlands Belgium Luxembourg Czechoslovakia Brazil Mexico Ethiopia Costa Rica	Germany Japan Italy Hungary Romania Bulgaria Finland Thailand Manchukuo Croatia Slovakia	Victory Collapse of the Third Reich Fall of Japanese and Italian Empires Creation of the United Nations Emergence of the United States and the Soviet Union as superpowers Beginning of the Cold War
Costa Rican Civil War (1948)	Costa Rica Calderon forces People's Vanguard Party (Costa Rica) Forces of Somoza	National Liberation Movement Ulatistas Supported by: United States	Regime change Teodoro Picado Michalski toppled
Calderonista invasion of Costa Rica (1955)	Costa Rica Supported by: United States	Nicaragua Calderón forces CIA (alleged) Supported by: Nicaragua Venezuela United States (alleged)	Victory Nicaraguan withdrawal from Costa Rica.
American occupation of the Dominican Republic (1965–1966)	United States Brazil Honduras Paraguay Nicaragua Costa Rica El Salvador Dominican Armed Forces Training Center (SIM) Dominican Military Intelligence Service	Dominican Republic	Victory Juan Bosch excluded from Presidency Election of Joaquín Balaguer