Vaca, derived from Latin vacca, is a word meaning “cow” in several Ibero-Romance languages. It also may refer to:
In geography:
- Vaca Mountains, a mountain range in Napa County, California
- Vaca Díez Province, Bolivia
- Vaca Mare River, a tributary of the Siriu River in Romania
- Vaca Mică River, a tributary of the Siriu River in Romania
- Mount Vaca, located in northern California
- Key Vaca, an island in the middle Florida Keys
In people:
- Danny Vaca (born 1990), Ecuadorian football (soccer) player
- Doyle Vaca (born 1979), Bolivian football (soccer) player
- Edder Vaca (born 1985), Ecuadorian football (soccer) player
- Jorge Vaca (born 1959), Mexican boxer
- Joselito Vaca (born 1984), Bolivian football (soccer) player
- Piraí Vaca, Bolivian classical guitarist
In other:
- Vaca Valley Railroad, operated at Vacaville, California in the late 19th century