MSFC
- Maharashtra State Financial Corporation
- Mamelodi Sundowns F.C.
- Markethill Swifts F.C.
- Marshall Space Flight Center
- Melbourne Science Fiction Club
- Metropolitan Sports Facilities Commission
- Michigan Stars FC
- Mickleover Sports F.C.
- Microsoft Foundation Class
- Moroka Swallows F.C.
- Multilayer switch
- Munster Senior Football Championship