- In Spanish, "caja" can mean:
- Box, container, or crate
- Cash register or cash box
- Chest or trunk
- Savings bank or safe-deposit box
- A store or shop
- In Portuguese, "caixa" has similar meanings to the Spanish word, including:
- Box or container
- Cash register or cash box
- Chest or trunk
- In Tagalog (Filipino), "caja" specifically refers to a cash register or cash box.
- In Mexican cuisine, "caja china" is a traditional cooking method involving a slow-roasted, covered dish.
- In zoology, "caja" is a genus of butterflies from the family Lycaenidae, found primarily in South and Central America.
- In anatomy, "caja torácica" is the Spanish term for the rib cage or thoracic cavity.
- In finance, "caja chica" is a Spanish term for a petty cash fund or a cash float.
- In geography, "Caja del Agua" is a lake located in the Spanish Canary Islands.
- In music, "Caja de música" is the Spanish term for a music box.