M3 motorway may refer to:
M3 motorway or Riverside Expressway, part of the Pacific Motorway in Brisbane, Queensland, Australia M3 motorway (Great Britain), a motorway in England M3 motorway (Hungary), a motorway in Hungary M3 motorway in the Republic of Ireland, part of the N3 national primary road M3 motorway (Northern Ireland), an urban motorway in Belfast, Northern Ireland M3 motorway (Pakistan)
See also M-3 (Michigan highway), a state highway in the Detroit metropolitan area M3 (Cape Town), an expressway in Cape Town, South Africa M3 highway (Russia), another name for the Ukraine Highway in Russia Eastern Freeway (Melbourne) or EastLink (Melbourne) in Victoria, Australia, both of which are numbered as M3