| Conflict: | Breña campaign |
| Partof: | War of the Pacific |
| Date: | February 1881 – November 1883 |
| Place: | Sierra (Andean region), Peru |
| Result: | Chilean victory
|
| Combatant1: |  Chile ---- Government of La Magdalena (until 1881)---- Government of Iglesias (since 1883) |
| Combatant2: | Peru's divided factions |
| Commander1: | Patricio Lynch---- Francisco García Calderón (until 1881)---- Miguel Iglesias (since 1883) |
| Commander2: | Andrés Avelino Cáceres---- Nicolás de Piérola---- Francisco García Calderón ---- Miguel Iglesias (until 1882)----Other minor leaders |
The Breña campaign, or Sierra campaign, was the last phase of the land campaigns of the War of the Pacific. This stage begins after the occupation of Lima, in February 1881, and extends until the consolidation of the Treaty of Ancón, between October and November 1883, which ends the war, with favorable conditions for Chile.