USS Shrimp (SP-645) was a United States Navy patrol vessel in commission from 1917 to 1918. Shrimp was built as a private motorboat of the same name by the Gas Engine and Power Company at Morris Heights in the Bronx, New York, in 1912. On 14 May 1917, the U.S. Navy acquired her from her owner, H. W. D. Rudd of Boston, Massachusetts, for use as a section patrol boat during World War I. She was commissioned as USS Shrimp (SP-645) on 21 August 1917. Shrimp was decommissioned on 30 November 1918 and returned to Rudd on 25 February 1919.