MCRR
| Acronym | Definition |
|---|---|
| MCRR | Medical Care Research and Review |
| MCRR | Midwest Central Railroad (Mount Pleasant, IA) |
| MCRR | Michigan Central Railroad |
| MCRR | Machine Check Recording and Recovery |
| MCRR | Marine Corps Recruiting Ribbon (US DoD) |
| MCRR | Movement Control and Readiness Reporting |
| MCRR | Main Cardiovascular-Respiratory Rhythm (neurophysiology) |