SS Mission Purisima was a Type T2-SE-A2 tanker built for the United States Maritime Commission during World War II. After the war she was acquired by the United States Navy as USS Mission Purisima (AO-118). Later the tanker transferred to the Military Sea Transportation Service as USNS Mission Purisima (T-AO-118). She was a member of the Mission Buenaventura-class oiler and was named for Mission La Purísima Concepción near Lompoc, California.