M40

M40 or M-40 may refer to:

• 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

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

• 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

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

• Samsung Galaxy M40, a smartphone

• M40, a song by Aitch from the album 4

• 40M (disambiguation)