José Joaquín de la Santísima Trinidad Moraga (22 August 1745 - 1785), usually simply known as José Joaquín Moraga, was a Spanish colonial expeditionary and soldier who founded San Jose, California, in 1777.
Moraga was second in command to Juan Bautista de Anza in the 1776 overland colonizing expedition from the region of Alta California which would become part of southern Arizona and northern Mexico, to what is now San Francisco, California. When de Anza returned south to the established base in 1777, Moraga was left in charge of efforts to build housing for the colonists and a military headquarters, the Presidio of San Francisco.
Moraga founded the Pueblo of San José on orders from Antonio María de Bucareli y Ursúa, Spanish Viceroy of New Spain. The pueblo was founded in honor of Saint Joseph on November 29, 1777 as the first official civilian settlement in Alta California.
Moraga's son Gabriel Moraga, born in the northern frontier region of the Viceroyalty of New Spain (in present-day southern Arizona), also became a Spanish soldier in Alta California and led expeditions exploring the San Joaquin Valley in the early years of the 1800s.
Streets in San Francisco, California are named after him and Spanish explorers (de) Anza, (de) Argüello, Balboa and Cabrillo.