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
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
Athletics
- M 40, an age group for Masters athletics (athletes aged 35+)
Technology
- Samsung Galaxy M40, a smartphone
See also
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