USS Herman S. Caswell (SP-2311), was a United States Navy patrol vessel in service from 1918 to 1919. Herman S. Caswell was built as a civilian passenger yacht or ferry of the same name in 1878 at Noank, Connecticut. On 8 October 1918, the U.S. Navy chartered her from her owner, New York Sightseeing Yachts, for use as a section patrol boat during World War I. She was placed in service as USS Herman S. Caswell (SP-2311) with Ensign C. N. Allison, USNRF, in command.