A40 or A-40 may refer to:
Roads
Other uses
- A40, a Queen's Pawn Game, Encyclopaedia of Chess Openings code
- Antonov A-40, a Soviet flying tank design
- Archambault A40, a French sailboat design
- Archambault A40RC, a French sailboat design
- Austin A40, a car from the British Motor Corporation
- Innocenti A40, variant of the Austin A40 produced by Innocenti
- Beriev A-40, an aircraft
- Continental A40, a four-cylinder, horizontally opposed, air-cooled aircraft engine
- Route A40 (WMATA), a bus route operated by the Washington Metropolitan Area Transit Authority
- Samsung Galaxy A40, a midrange smartphone by Samsung
See also