M61 or M-61 may refer to: In transportation:M61 motorway, a motorway in England.M-61 (Michigan highway), a state highway in Michigan.M61, a class of locomotives built by NOHAB. In science:Messier 61 (M61), a spiral galaxy in the Virgo Cluster. In firearms and military equipment:M61 Vulcan, a Gatling gun used by the United States Armed Forces.M61 (grenade), a fragmentation hand grenade used by the United States Armed Forces.M61 Skorpion, a Yugoslav designation for the CZ-Scorpion pistol.M61 gas m… (More on M61)