| Isla Monserrate | |
| Image Caption: | Isla Monserrate |
| Map: | Mexico |
| Location: | Gulf of California |
| Coordinates: | 25.6836°N -111.0317°W |
| Elevation M: | 200 |
| Country: | Mexico |
| Country Admin Divisions Title: | State |
| Country Admin Divisions: | Baja California Sur |
| Population: | Uninhabited |
Isla Monserrate, is an island in the Gulf of California east of the Baja California Peninsula. The island is uninhabited and is part of the Loreto Municipality.
Isla Monserrate has 13 species of reptiles, including the endemic Isla Monserrate whiptail (Aspidoscelis pictus).[1]