Vice Admiral Morton Lyndholm Deyo (1 July 1887 – 10 November 1973) was an officer in the United States Navy, who was a naval gunfire support task force commander of World War II. Born on 1 July 1887 in Poughkeepsie, New York, he graduated from the United States Naval Academy in 1911, and served over a career of 38 years. His highest Navy rank in active service was Rear Admiral, attaining Vice Admiral at retirement. He was awarded three medals of personal honor, the Distinguished Service Medal (Navy), and the Legion of Merit with Gold Star.