Laja may refer to:
- Bolivia
- Laja Municipality, a subdivision of La Paz Department
- Laja, Bolivia, a town in the municipality
- Chile
- Laja, Chile, a town in Bío-Bío Province
- Laja Lake
- Laja Falls
- Isla del Laja
- Panama
- La Laja, a corregimiento in Las Tablas District, Los Santos Province, Panama
- Syria
- Lajat, also spelled Laja, a geographic region