M40
# M40

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
