2M or 2-M may refer to:
- 2m, or two metres
- 2 million
- Amateur radio 2-meter band
- 2M (DOS), a DOS program that formats extra high capacity floppy disks
- 2M TV, a Moroccan state-owned TV station
- 2M Group, an alliance of local authorities surrounding Heathrow Airport outside London, UK
- a prefix used by the Two Micron All-Sky Survey (2MASS)
- Moldavian Airlines, IATA airline designator 2M
- 2M (alliance), a container shipping industry alliance between Maersk Line and MSC
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