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- Magna - USA
- Malvern Star - Australia
- Marin Bikes - USA
- Masi Bicycles - USA
- Matchless - UK (defunct)
- Matra - France
- Melon Bicycles - USA
- Mercian Cycles - UK
- Merida Bikes - Taiwan
- Merlin - USA
- Merckx - Belgium
- Miele bicycles - Canada
- Milwaukee Bicycle Co. - USA
- Minerva - Belgium (defunct)
- Miyata - Japan
- Monark - Sweden/Brazil/Peru
- Mondia - Switzerland
- Mongoose - USA
- Montague - USA
- Moots Cycles - CO, USA
- Moser Cicli - Italy
- Motobécane - France
- Moulton - UK
- Murray - USA
- Muddy Fox - UK (other brand: Silver Fox)
Read more about this topic: List Of Bicycle Brands And Manufacturing Companies