USS Constance II (SP-633), later USS YP-633, was a United States Navy patrol vessel in commission from 1917 to 1922. Constance II was built as a private motorboat of the same name by the Holmes Motor Boat Company at West Mystic, Connecticut, in 1914. On 6 July 1917, the U.S. Navy acquired her from her owner, Joseph Gahm of Boston, Massachusetts, for use as a section patrol boat during World War I. She was commissioned as USS Constance II (SP-633) on 30 July 1917.