USS J. William Ditter (DD-751/DM-31) was a Robert H. Smith-class destroyer minelayer in the United States Navy. She was named for Congressman J. William Ditter. J. William Ditter was launched as DD-751 by Bethlehem Shipbuilding Corporation, Staten Island, New York, 4 July 1944; sponsored by Mrs. J. William Ditter, widow of Congressman Ditter; reclassified DM-31 19 July 1944; and commissioned at New York Navy Yard 28 October 1944, Commander R. R. Sampson in command.