Gregory Curtis Horn (born May 6, 1953) is a Rear Admiral in the United States Navy. He retired in 2013 as 17th Deputy Chief of Chaplains for Reserve Matters and Director of Religious Programs, Marine Forces Reserve. Commissioned a lieutenant in 1988, Horn's Navy Reserve tours included: USS Bristol County (LST 1198); Naval Hospital San Diego; Naval Mobile Construction Battalion 17. He also served as Assistant Fleet chaplain, Commander, Submarine Forces Pacific.