USS Doris B. III (SP-733) was a United States Navy patrol vessel in commission from 1917 to 1918. Doris B. III was built as a private motorboat of the same name by Britt Brothers at Lynn, Massachusetts, in 1912. In June 1917, the U.S. Navy acquired her under a free lease from her owner, J. R. Jewett of Cambridge, Massachusetts, for use as a section patrol boat during World War I. She was commissioned as USS Doris B. III (SP-733) on 25 June 1917 with Boatswain's Mate F. B. Laight in command. Doris B. III was decommissioned after the end of the war and returned to Jewett on 3 December 1918.