M49

M49 or M-49 may be:


 * Messier 49, an elliptical galaxy in the constellation Virgo
 * The 49th known Mersenne prime
 * M49 motorway, a motorway in Great Britain
 * M49 (Cape Town), a Metropolitan Route in Cape Town, South Africa
 * M49 (Johannesburg), a Metropolitan Route in Johannesburg, South Africa
 * M49 telescope, a telescope used by the United States military
 * M-49 (Michigan highway), a Michigan state highway
 * UN M49, the United Nations' "Standard Country or Area Codes for Statistical Use"
 * M/49, or the Neuhausen pistol, the Danish name for the SIG Sauer P210