| Conflict: | Battle of Arapey |
| Partof: | the Portuguese conquest of the Banda Oriental |
| Date: | 3 January 1817 |
| Place: | Salto, Uruguay |
| Result: | Luso-Brazilian victory |
| Combatant1: | United Kingdom of Portugal, Brazil and the Algarves |
| Combatant2: | Federal League |
| Commander1: | José de Abreu Mena Barreto |
| Commander2: | José Gervasio Artigas |
| Strength1: | 600 2 artillery pieces |
| Strength2: | 500 |
| Casualties1: | Light |
| Casualties2: | Very heavy |
The Battle of Arapey was an encounter between the Luso-Brazilian forces under José de Abreu Mena Barreto and the Artiguist forces led by José Artigas, the independentist caudillo himself, in Salto, modern-day Uruguay.
The encounter ended with a decisive victory for the Luso-Brazilian forces.