Mission San Miguel (Spanish: Misión San Miguel Arcángel de la Frontera) was a Spanish mission established on 28 March 1787 by the Dominican missionary Luis Sales among the Kumeyaay people of northwestern Baja California, Mexico. The ruins of the mission are located in present-day Ejido La Misión, Baja California in the municipio of Ensenada. The mission ruins are behind the local school, on the north side of Highway 1.