| Mountain Comprehensive Health Corporation | Business |
| Michigan Collegiate Hockey Conference | Community |
| Maternal Child Health Coalition | Community |
| My Crypto Heroes | Cryptocurrency |
| Mean Cell Haemoglobin Concentration | General |
| Mean Corpuscular Hemoglobin Content | General |
| Make Chavs History Campaign | General |
| Mean Cell Hemoglobin Concentration | General |
| Mean Corpuscular Haemoglobin Concentration | General |
| microcrystalline Calcium hydroxyapatite compound | General |
| Mitsubishi Celeste Hobby Club | General |
| Mean Corpuscular Haemoglobin Content | General |
| Mean Corpuscle Hemoglobin Concentration | General |
| Mean Cell Hb Concentration | General |
| Mean Cellular Hemoglobin Concentration | General |
| Mountainlands Community Health Center | Medical |
| Metropolitan Chicago Healthcare Council | Medical |
| Maternal and Child Health Centre | Medical |
| Munson Community Health Center | Medical |
| Maternal and Child Health Consortium | Medical |
| Middletown Community Health Center | Medical |
| Mendocino Community Health Clinic | Medical |
| Manchester Community Health Center | Medical |
| Madison County Health Coalition | Medical |
| Mattapan Community Health Center | Medical |
| Mean Corpuscular Hemoglobin Concentration | Medical |
| Montgomery County Hispanic Chamber | Regional |
| Morris County Heritage Commission | Regional |
| Metropolitan Collegiate Hockey Conference | Sports |
