USS Herman S. Caswell (SP-2311)

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.

Assigned to the 3rd Naval District, Herman S. Caswell served on patrol and harbor duties until returned to New York Sightseeing Yachts on 7 March 1919.