Lloyd Montague Mustin (July 30, 1911 – January 21, 1999) was a vice admiral in the United States Navy and among the namesakes of USS Mustin (DDG-89). He took part in developing the Navy's first lead-computing anti-aircraft gun sight, which proved of major importance in the air-sea actions of World War II, and he served on the cruiser USS Atlanta during the naval battle of Guadalcanal. His ship was lost during that action, and with other survivors he landed on Guadalcanal and served ashore with a naval unit attached to the First Marine Division. His postwar service included commands at sea and development and evaluation of weapon systems. He later served as director of operations for the Joint Chiefs of Staff during the Vietnam War.