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)

• 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

This disambiguation page lists articles about roads and streets with the same name.
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