USNS Sirius (T-AFS 8) was a Sirius-class combat stores ship of the United States Navy, named for Sirius (α Can. Maj.), the brightest visible star. Sirius was built by Swan Hunter & Wigham Richardson for the Royal Navy. Laid down in 1965, she was launched in 1966 from Wallsend as RFA Lyness (A339). She was transferred from the British Royal Fleet Auxiliary to the U.S. Navy's Military Sealift Command in 1981.