A40 or A-40 may refer to:
Roads Autoroute 40, a highway in Québec A40 motorway (France) A40 motorway (Germany) A40 road (Great Britain), a road connecting London and Fishguard, Wales A40 road (Northern Ireland), a road running from the L/Derry to Raphoe A40 road (Isle of Man), a primary road which connects the A3 with the A1
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 List of highways numbered 40