USS Liberty (ID-3461), was a transport ship launched in June 1918 and decommissioned in May 1919, and as USAT Liberty, a United States Army transport ship sunk in 1942
USS Liberty (AGTR-5), was a ship strafed and bombed by Israeli airforce in June 1967, resulting in more than 34 dead and 171 wounded and its decommissioning as beyond repair (USS Liberty incident is the main article concerning the attack).