USS Florence (SP-173) was a yacht leased from her owner by the U.S. Navy during World War I. She was outfitted as an armed patrol craft, and her owner, Ensign James W. Alker, was named as commanding officer of the yacht and its crew of sixteen. Florence, based out of New York City, was assigned various duties in the Long Island Sound. Post-war she was reconfigured to her original civilian condition, and was returned to her owner.