USS O'Callahan (FF-1051) was a U.S. Navy Garcia-class destroyer escort, later reclassified as a frigate. She was named for Chaplain Lieutenant Commander Joseph T. O'Callahan, a World War II Medal of Honor recipient for his rescue of crewmen on the aircraft carrier Franklin after it was hit and severely damaged by enemy bombs.

Garcia-class frigates were United States Navy warships. These frigates were originally ocean escorts bearing the hull classification DE until 1975. The ships were commissioned between 1964 and 1968 and decommissioned between 1988 and 1990.