USS Polly (SP-690) was a United States Navy patrol vessel in commission from 1917 to 1919. Polly was built as the private motorboat Howmornel by the New York Yacht, Launch and Engineering Company at Morris Heights in the Bronx, New York, in 1909. She later was renamed Kakhin IV and Polly. On 14 May 1917, the U.S. Navy purchased Polly from William H. Merriman, of New Haven, Connecticut, for use as a section patrol boat during World War I. She was commissioned at Newport, Rhode Island, as USS Polly (SP-690) on 15 May 1917 with Chief Quartermaster H. L. Wakeman, USNRF, in command.