M46 or M-46 may refer to: * M46 Patton, an American main battle tank * Messier 46, an open star cluster in the constellation Puppis * , a Volvo M45 (Four-speed) with an electric overdrive added * M-46 (Michigan highway), a state highway in Michigan * the 46th known Mersenne prime * M1946 Sieg automatic rifle * Halcón M-1943, an Argentine submachine gun * Madsen M/50, a Danish submachine gun * 130 mm towed field gun M1954 (M-46), a Soviet artillery piece This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.