Sierra de la Laguna, Granite mountain range in Baja California Sur, Mexico.

Sierra de la Laguna is a mountain range at the southern end of Mexico's Baja California peninsula, in La Paz and Los Cabos municipalities. Its high point, Sierra de la Laguna High Point, reaches 2,080 meters, the highest in Baja California Sur. The range is mostly massive intrusive rock, granite and syenite, probably part of a Cretaceous batholith. Its upper slopes carry pine-oak forests, with the endemic Laguna pinyon pine.

The southern tip of the Baja California peninsula, including this range, was formerly an island in prehistoric times. The mountains are largely Cretaceous granite and syenite, part of a batholith underlying much of the peninsula. On 6 June 1994 a presidential decree established the Sierra de la Laguna Biosphere Reserve, with a core area of 32,519 hectares and buffer zones.

Local people use these mountains for ranching and forest activities that have continued for many generations. The communities living near it depend on the land's resources and maintain ways of life adapted to this highland environment.

Access is available through several valleys and canyons that offer different difficulty levels for hiking. Traveling with an experienced guide is advisable to navigate the paths safely and understand the terrain.

This mountain range captures more rainfall than the surrounding desert areas, creating its own climate with distinctly wetter conditions. These moister conditions allow hundreds of plant species to grow here, many found nowhere else in the region.