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)	Costa Rica Nicaragua Kingdom of Mosquitia Guatemala Honduras El Salvador United States	Filibusters	Victory William Walker's army is defeated and he is arrested by the American Navy
Barrios' War of Reunification (1885)	El Salvador Mexico Costa Rica Nicaragua	Guatemala Honduras	Victory Withdrawal of Guatemalan soldiers Death of Justo Rufino Barrios
World War I (1918)	France United Kingdom Russia United States Italy Japan China Canada Australia New Zealand India South Africa Serbia Montenegro Romania Belgium Greece Portugal Brazil Cuba Panama Guatemala Nicaragua Costa Rica Honduras	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)	United States Soviet Union United Kingdom China France Poland Canada Australia New Zealand India South Africa Yugoslavia Greece Denmark Norway Netherlands Belgium Luxembourg Czechoslovakia Brazil Mexico Panama Costa Rica El Salvador Guatemala Honduras Nicaragua Dominican Republic Cuba	Germany Japan Italy Hungary Romania Bulgaria Croatia Slovak Republic (1939–1945) Thailand Manchukuo Mengjiang	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 Calderón Forces People's Vanguard Party Somoza Forces	National Liberation Movement Ulatistas	Regime change Teodoro Picado Michalski toppled
Calderonista invasion of Costa Rica (1955)	Costa Rica	Calderón Forces Nicaragua	Victory Nicaraguan withdrawal from Costa Rica
Dominican Civil War (1965–1966)	Dominican Loyalists United States Brazil Paraguay Honduras Nicaragua Costa Rica El Salvador	Dominican Constitutionalists	Victory Juan Bosch excluded from Presidency Election of Joaquín Balaguer