| Acronym | Definition |
|---|
| MRRC | Michigan Retirement Research Center |
| MRRC | Mississippi River Research Consortium |
| MRRC | Magnetic Resonance Research Centre (Cambridge University) |
| MRRC | Medical Radiological Research Center (Russian Academy of Medical Sciences) |
| MRRC | Materiel Requirements Review Committee |
| MRRC | Mohawk River Research Center, Inc |
| MRRC | Maximum Ratio Receiving Combining |
| MRRC | Material Resource Recovery Commander |
| MRRC | Miniaturized Rat-Race Coupler (microwave theory) |
| MRRC | Mystic River Rugby Club (Malden, MA) |
| MRRC | Midland Rolls-Royce Club (automobile club; UK) |