Isla Tortuga (Tortuga Island) is an island in the Gulf of California, created relatively recently in geologic terms by the volcanism associated with the East Pacific Rise.

It lies east-northeast of the city of Santa Rosalía, in Mulegé Municipality.

It has a surface area of 11.374 km2 (4.39 sq mi).

[1] The Tortuga Island rattlesnake (Crotalus tortugensis) is a species endemic to Isla Tortuga — it is found nowhere else.

This article about a location in the Mexican state of Baja California Sur is a stub.