Caja (meaning "box" in Spanish) can refer to:
- Caja or caixa, a Spanish savings bank similar to a credit union
- Caja project, a Google security-project for "virtual iframes"
- Caja del Rio, a mesa in New Mexico, USA
- Caja vallenata, a drum similar to a tambora
- Caja China, see Nochebuena
- Caja, the official file manager for the MATE desktop environment