M series
- Bedford M series
- Cummins M-series engine
- Dodge M-series chassis
- Juniper M series
- Leica M series
- M (disambiguation)
- M series (Apple silicon)
- M series (Toronto subway)
- M series (computer)
- M-series bayonet
- Meizu
- QI (M series)
- Rover M-series engine
- Samsung Galaxy M series
- Sony Ericsson M series
- Sony Vaio M series
- Studebaker M-series truck
- TVR M series
- ThinkCentre M series