USS Lillie B (SP-1502), also SP-1520, sometimes spelled Lillie B., was a motorboat leased by the United States Navy in 1917 for use as a patrol boat. Lillie B was built in 1881 at New Orleans, Louisiana. The U.S. Navy leased her on 20 April 1917 from her owner, E. Macrenaris of Tarpon Springs, Florida, for use as a patrol boat during World War I. Lillie B saw no active naval service, and the Navy returned her to her owner on 5 September 1917.