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This is a list of wars involving the Federative Republic of Brazil and its predecessor states, starting from 1815, when Brazil was elevated to a kingdom within the United Kingdom of Portugal, Brazil, and the Algarves, up to the present day.
| Conflict | Combatant 1 | Combatant 2 | Result | King | 
|---|---|---|---|---|
| Portuguese conquest of the Banda Oriental (1816–1820) |  United Kingdom of Portugal, Brazil and the Algarves | Luso-Brazilian victory 
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| Conflict | Combatant 1 | Combatant 2 | Result | Emperor | 
|---|---|---|---|---|
| Brazilian War of Independence (1822 [1] –1825) | Independentists  Empire of Brazil (from 7 September 1822) | Loyalists | Independentist victory | |
| Confederation of the Equator (1824) |  Empire of Brazil |  Confederation of the Equator | Loyalist victory | |
| Cisplatine War (1825–1828) |  Empire of Brazil |  United Provinces | Preliminary Peace Convention 
 | |
| Irish and German Mercenary Soldiers' revolt (1828) |  Empire of Brazil | Irish and German Mercenary Rebels | Empire of Brazil victory 
 | |
| Cabanagem (1835–1840) |  Empire of Brazil |  Cabanos | Empire of Brazil victory | |
| Ragamuffin War (1835–1845) |  Empire of Brazil | Imperial victory 
 | ||
| Sabinada (1837–1838) |  Empire of Brazil |  Bahia Republic | Government victory 
 | |
| Platine War (1851–1852) |  Empire of Brazil Co-belligerent: |  Argentine Confederation | Brazilian-led allied victory [2] 
 | |
| Uruguayan War (1864–1865) | Brazilian–Colorado victory 
 | |||
| Paraguayan War (1864 [5] –1870) |  Paraguay | Allied victory 
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| Conflict | Combatant 1 | Combatant 2 | Result | President | 
|---|---|---|---|---|
| Federalist Revolution (1893–1895) |  Brazil | Government victory | ||
| Trinidad Conflict (1893-1897) |   |  Principality of Trinidad  United Kingdom | Government Victory 
 | |
| Manhuassu Conflict (1896) |  Brazilian government | Manhuassu Republic | Government victory 
 | |
| War of Canudos (1896–1897) |  Brazil | Canudos inhabitants | Government victory 
 | |
| Acre War (1899–1903) |  Republic of Acre Supported by:  Brazil |  Bolivia Supported by:  United States | Brazilian victory 
 | |
| Contestado War (1912–1916) |  Rebels | Government victory | ||
| First World War (1914–1918) (Limited involvement, 1917–1918) | Allied Powers: | Central Powers: 
 | Allied Powers victory (see Aftermath of World War I) 
 | |
| Constitutionalist Revolution (1932) | 
 | Government and loyalist victory | ||
| Second World War (1939–1945 [c] ) (Limited involvement, 1942–1945) | Allies  United States  Soviet Union  United Kingdom  China  Brazil and others | Axis  Germany  Italy  Japan and others | Allied victory | |
| Dominican Civil War (1965 [6] ) |  Loyalist faction  United States |  Constitutionalist faction | Loyalist victory 
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