SS Mission Loreto was a Type T2-SE-A2 tanker built for the United States Maritime Commission during World War II.

She was a Mission Buenaventura-class oiler and was named for Misión de Nuestra Señora de Loreto Conchó, located in Loreto, Baja California Sur, Mexico, considered the "Head and Mother of all the California Missions."

Mission Loreto was laid down on 27 April 1944 under a Maritime Commission contract by Marine Ship Corporation, Sausalito, California; launched 28 June 1944; sponsored by Mrs. S. D. Bechtel; and delivered 22 July 1944.

On 1 October 1949 she was still performing these duties, but was under control of the new Military Sea Transportation Service and was designated USNS Mission Loreto (T-AO-116).

This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.