San Martin or San Martín (Spanish for Saint Martin) is a village and census-designated place (CDP) in Santa Clara County, California, in the southern Santa Clara Valley.

Located to the south of Morgan Hill and north of Gilroy, San Martin is characterized by ranches, wineries, and orchards, as well as large estates in the foothills of the Santa Cruz Mountains.

According to the United States Census Bureau, the CDP has a total area of 11.6 square miles (30 km2), all of it land.

Due to the moderating influence of the Pacific Ocean, San Martin enjoys a warm, Mediterranean climate.

Average annual rainfall is 480 mm (18.9 in), and the summer months are typically dry.

Summer months are characterized by coastal fog which arrives from the ocean around 10 p.m. and dissipates the next morning by 10 a.m. Winter months have many sunny and partly cloudy days, with frequent breaks between rainstorms.

The local climate supports chaparral and grassland biomes, with stands of live oak at higher elevations.

The 2010 United States Census[4] reported that San Martin had a population of 7,027.

There were 2,122 housing units at an average density of 183.0 per square mile (70.7/km2), of which 1,309 (65.7%) were owner-occupied, and 684 (34.3%) were occupied by renters.

San Martin is a large producer of garlic, table mushrooms, and wine.

In the California State Legislature, San Martin is in the 17th Senate District, represented by Democrat John Laird, and in the 30th Assembly District, represented by Democrat Dawn Addis.