| San Esteban Island | |
| Image Caption: | San Esteban Island |
| Map: | Mexico |
| Location: | Gulf of California |
| Coordinates: | 28.6975°N -112.5775°W |
| Country: | Mexico |
| Country Admin Divisions Title: | State |
| Country Admin Divisions: | Sonora |
| Population: | Uninhabited |
San Esteban Island (Spanish; Castilian: Isla San Esteban, Seri: Coftéecöl pronounced as /sei/ and sometimes Hast pronounced as /sei/)[1] is a small island in the Gulf of California, Mexico, located to the southwest of Tiburón Island. It is part of the Municipality of Hermosillo in Sonora and has a land area of 39.773 km2 (15.356 sq mi), the 15th-largest island in Mexico. It is located in the Gulf of California. It was once inhabited by a group of the Seri people.[2]
San Esteban Island is home to many types of rare animal species found on only a few of the islands, such as the San Esteban chuckwalla (Sauromalus varius), the spiny chuckwalla (S. hispidus) and the spiny-tailed iguana (Ctenosaura conspicuosa).[3]