- One of the 31 states of Mexico, formally the Free and Sovereign State of Oaxaca, located in the southern part of the country, west of the Isthmus of Tehuantepec.
- The largest city in the state of Oaxaca, for which the state is named.
- A white, semihard cheese from Mexico.
- Rhymes: -a
- A state of Mexico.
- OA (abbreviation)