| Isla Cerraja | |
| Image Caption: | Isla Cerraja |
| Map: | Baja California#Mexico |
| Location: | Gulf of California |
| Coordinates: | 28.9968°N -113.5192°W |
| Elevation M: | 15 |
| Country: | Mexico |
| Country Admin Divisions Title: | State |
| Country Admin Divisions: | Baja California |
| Population: | uninhabited |
Isla Cerraja, or the Lock, is an island in the Gulf of California, located within Bahía de los Angeles off of the Baja California Peninsula. The island is uninhabited and is part of the Ensenada Municipality.
Isla Cerraja has only one species of reptile, the Common Side-blotched Lizard (Uta stansburiana).