Donald Bradley Duncan (1896–1975) was an admiral in the United States Navy, who played an important role in aircraft-carrier operations during World War II. Duncan graduated from the United States Naval Academy in 1917, and was assigned to the USS Oklahoma (BB-37). He received a masters degree in radio engineering from Harvard University in 1925. In 1941, he was the first commander of the USS Long Island, the Navy's first escort aircraft carrier. Following his retirement from the navy on March 1, 1957, he served as Governor of the Naval Home until May 1962. He died on September 8, 1975.