USS Lykens (SP-876/AT-56) was a steam tugboat purchased from the Reading Company by the United States Navy in 1917. Because she was privately built, she was not of a ship class. She was the only U.S. Navy ship of this name. The ship served on the East Coast, in Bermuda, and in the Azores during World War I. After the war, she operated from New York and Norfolk, Virginia until decommissioning in 1922. She was considered one of the most powerful tugs in the Navy during her career. Lykens was sold in 1934.