M3 motorway

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)