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 Chiltern Railways, previously known as M40 Railways