USS Suffolk County (LST-1173) was a De Soto County-class tank landing ship built for the United States Navy during the late 1950s. Named after counties in Massachusetts and New York, she was the only U.S. Naval vessel to bear the name. Suffolk County was laid down on 17 July 1955 by the Boston Naval Shipyard, Boston, Massachusetts; launched on 5 September 1956; sponsored by Mrs. Thomas P. O'Neill, Jr.; and commissioned on 15 August 1957 with Lieutenant Commander James E. Brown in command.