The Spanish missions in Baja California were a large number of religious outposts established by Catholic religious orders, the Jesuits, the Franciscans and the Dominicans, between 1683 and 1834 to spread the Christian doctrine among the Native Americans or Indians living on the Baja California peninsula. The missions gave Spain a valuable toehold in the frontier land, and introduced European , fruits, vegetables, and industry into the region. The Indians were severely impacted by the introduction of European diseases such as smallpox and measles and by 1800 their numbers were a fraction of what they had been before the arrival of the Spanish.
Mexico secularized all missions in its territory in 1834 and the last of the missionaries departed in 1840. Some of the mission churches survive and are still in use.
As early as the voyages of Christopher Columbus, the Kingdom of Spain sought to establish missions to convert pagans to Catholicism in Nueva España (New Spain). New Spain consisted of the Caribbean, Mexico, and portions of what is now the Southwestern United States. To facilitate colonization, the Catholic Church awarded these lands to Spain.