MCM
- 1900
- Biosecurity
- Jacques and Marcelle Morgantini
- List of mine warfare vessels of the United States Navy
- M-C-M'
- MCM (TV channel)
- MCM London Comic Con
- MCM Worldwide
- MCM pistol
- MCM/70
- Macrocephaly-capillary malformation
- Magic Circle Music
- Magic City Misfits
- Manual for Courts-Martial
- Maranatha Campus Ministries
- Marine Corps Marathon
- Mathematical Contest in Modeling
- Maverick City Music
- Melbourne City Mission
- Methylmalonyl-coenzyme A mutase
- Microsoft Certified Master
- Mid-Century modern
- Mighty Car Mods
- Million cubic metre
- Mine countermeasures
- Minichromosome maintenance
- Mobil Composition of Matter
- Mobile content management
- Monaco Heliport
- Monte Carlo method
- Montreal Citizens' Movement
- Multi-chip module
- Music City Mystique
- PABCO Transit, Inc
- The Mad Capsule Markets