| Acronym | Definition |
|---|
| MCIR➣Michigan Care Improvement Registry (immunization information; est. 1998) |
| MCIR➣Michigan Childhood Immunization Registry |
| MCIR➣Maine Center for Integrated Rehabilitation (brain injury facility) |
| MCIR➣Materiel Change Information Report |
| MCIR➣McHenry County Independent Riders (Illinois motorcycle club) |