RM1

RM1 or variant, may refer to:


 * RM1, the postcode for a part of Romford, see RM postcode area
 * RM1 (Recife Model 1), a quantum computational method of calculating molecular electronic structure, a variant of Austin Model 1
 * Valmet RM 1, a class of two-bogie four-axle tram, see List of Valmet products
 * RocketMotorOne (RM1), a Tier-1 rocket engine for SpaceShipOne
 * RM1, a cancelled space station Russian Research Module
 * RM1, a type of railcar in the NZR RM class