USS Ellington (SP-776) was a United States Navy patrol vessel in commission from 1917 to 1919. Ellington was built as a civilian motor launch of the same name in 1915 for the Bureau of Immigration. In 1917, she was transferred to the U.S. Navy for use as a section patrol boat during World War I. She was commissioned on 22 May 1917 as USS Ellington (SP-776) with Boatswain's Mate E. Bellsinger, USNRF, in command. Assigned to the 12th Naval District, Ellington performed harbor patrol and guard ship duty in the San Pedro, California, area for the rest of World War I.