San Juan Bautista State Historic Park is a California state park encompassing the historic center of San Juan Bautista, California, United States. It preserves a significant concentration of buildings dating to California's period of Spanish and Mexican control. It includes the Mission San Juan Bautista, the Jose Castro House, and several other buildings facing the historic plaza. It became a state park in 1933 and was declared a National Historic Landmark in 1970. It is also a site on the Juan Bautista de Anza National Historic Trail.