MNR may stand for:
Transportation Maine Northern Railway Metro-North Railroad in New York State Mid-Norfolk Railway, a heritage railway in Norfolk, England Manx Northern Railway, a railway on the Isle of Man from 1879 to 1905 Manor Road railway station, Wirral, England
Manufacturing Marc Nordon Racing, a manufacturer of Kit Cars in the UK
Political movements , a political party in France , a Belgian resistance group , a political party in Bolivia , a progressive political party in Guatemala
Other uses
Marine Nature Reserve, a UK conservation designation McMaster Nuclear Reactor, a nuclear reactor in Canada Ministry of Natural Resources (Ontario), a government agency in Canada Minister of National Revenue (Canada), minister in charge of taxation