MMP
- Magellan Midstream Partners
- Maintenance management professional
- Marchwood Military Port
- Marian Movement of Priests
- Marilyn Monroe
- Mass market paperback
- Massively multiplayer online role-playing game
- Matrilysin
- Matrix metalloproteinase
- Measure Map Pro format
- Memphis Motorsports Park
- Metal Mind Productions
- Methuselah Mouse Prize
- Military Mounted Police
- Millennium Mathematics Project
- Miller Motorsports Park
- Minute Maid Park
- Minuteman Project
- Miss Moneypenny
- Missile Moyenne Portée
- Mixed-member proportional representation
- Moldova Steel Works
- Monday Morning Podcast
- Moscow Mathematical Papyrus
- Mucous membrane pemphigoid
- Multi-Man Publishing
- National Struggle Party
- Team Umizoomi
- Tokyo Mew Mew