R40, R-40, or similar, may refer to:
Roads R40 road (Belgium) R40 road (Ghana) R40 (South Africa)
Other uses R-40 (missile), a Soviet air-to-air missile R40 (New York City Subway car) Chloromethane, a refrigerant R40: Limited evidence of a carcinogenic effect, a risk phrase R40 Live Tour, a 2015 tour by Canadian rock band Rush R40 series of preferred numbers Renault R40, a French tank Rover 75, an executive car Samsung Sens R40, a laptop Toyota TownAce (R40), a Japanese van R40, a Ferris wheel designed by Ronald Bussink