M40 or M-40 may refer to:

Transportation

  • M40 motorway, a motorway in England
  • M-40 (Michigan highway), a state highway in Michigan, US
  • M40 (Cape Town), a Metropolitan Route in Cape Town, South Africa
  • M40 (Johannesburg), a Metropolitan Route in Johannesburg, South Africa
  • M40 (Pietermaritzburg), a Metropolitan Route in Pietermaritzburg, South Africa
  • Autopista de Circunvalación M-40, a motorway in Madrid, Spain
  • BMW M40, a 1987 automobile piston engine
  • Charomskiy M-40, an aircraft engine
  • Volvo M40 transmission, an automobile transmission
  • Chiltern Railways, previously known as M40 Railways

Science

  • Messier 40 (M40), a double star in the constellation Ursa Major
  • the 40th Mersenne prime

Firearms and military equipment

  • M40 field protective mask, a United States military gas mask
  • M40 rifle, a sniper rifle
  • M40 gun motor carriage, a United States self-propelled artillery vehicle
  • M40 recoilless rifle, an anti-tank gun
  • M/40 automatic cannon, a Swedish heavy machine gun
  • Macchi M.40, a prototype 1920s Italian catapult-launched reconnaissance seaplane
  • The incorrect designation for the SSh-40, a Russian infantry helmet
  • A collector's term for later versions of the M1935 Stahlhelm

Athletics

  • M 40, an age group for Masters athletics (athletes aged 35+)

Technology

  • Samsung Galaxy M40, a smartphone

Arts and entertainment

  • M40, a song by Aitch from the album 4

See also

  • 40M (disambiguation)