MRM
- List of airports in Papua New Guinea
- MRM//McCann
- Mad River Mountain
- Magnetic Resonance Microscopy
- Magnetic Resonance in Medicine
- Magyar Remény Mozgalom
- Maintenance Resource Management
- Maldives Reform Movement
- Maritime Resource Management
- Marymount MRT station
- Masters of Resource Management
- McArthur River mine (disambiguation)
- Mechanically recovered meat
- Men's rights movement
- Merlav language
- Metered reply mail
- Mini-Research Module (disambiguation)
- Minsky register machine
- Minterm-ring map
- Mister M (disambiguation)
- Monticello Railway Museum
- Mountaintop removal mining
- Multiple reaction monitoring
- Respect Moldova Movement
- Team Milram
- XM1111 Mid-Range Munition