San Martin (pronounced San Mar-'teen) is a census-designated place (CDP) and an unincorporated town in Santa Clara County, California, United States. The community has been considering incorporating into either a city or town since 2004, but no official action had been taken by the end of 2009. Like neighboring Morgan Hill and Gilroy, San Martin is a large producer of garlic and table mushrooms. It is also home to the volunteer-run Wings of History aviation museum, located next to South County Airport.