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M11 or M-11 may be:

  • Messier 11 (M11), an open star cluster also known as the Wild Duck Cluster
  • Mathieu group M11 in the mathematical field of group theory
  • Ritter M11 UltraClave, a model of autoclave made by Midmark
Firearms and military equipment
  • M11, a United States military designation for the SIG Sauer P228 semi-automatic pistol
  • Ingram MAC-11, a sub-compact machine pistol
  • M-11 Shtorm, a 1959 Russian naval surface-to-air missile system
  • Fiat M11/39, an Italian medium tank used during World War II
  • Grigorovich M-11, a 1916 Russian single-seat fighter flying boat
  • Mk 11 Mod 0 Sniper Weapon System, a variant of the SR-25 used by the United States Navy
  • Remington 11-87, a semi-automatic shotgun
  • Panhard ULTRAV M11, a reconnaissance variant of the Véhicule Blindé Léger marketed to the US Army