| Acronym | Meaning |
| MMR | Burma (ISO Country code, now Myanmar) |
| MMR | Machinist's Mate, Refrigeration (US Navy) |
| MMR | Main Machinery Room |
| MMR | Maintenance Management Review |
| MMR | Management Milestone Record |
| MMR | Manpower Mobilization Request |
| MMR | Marine Mammal Regulations (Federal Fisheries Act; Canada) |
| MMR | Massachusetts Military Reservation |
| MMR | Maximum Medical Recovery (Workplace Safety and Insurance Act, RSO 1998, Canada) |
| MMR | Merchant Marine Reserve |
| MMR | Middle Mississippi River |
| MMR | Military Munitions Rule |
| MMR | Minimum Maintenance Road (various locations) |
| MMR | Minimum Military Requirement |
| MMR | Mission Requirements Review |
| MMR | Mobile Mission Recognition |
| MMR | Mobilization Material Requirement |
| MMR | Monthly Management Review |
| MMR | Multi Mode Radar |
| MMR | Multi-Mission Radar (Army) |
| MMR | Multiband Multimode Radio |
| MMR | Multimode Radar |