| Abbreviation | Definition |
|---|---|
| MGO | Major Gift Officer |
| MGO | Morton Grove Organization |
| MGR | Mustang Grabber Registry |
| MHAM | Mental Health Association in Michigan |
| MHAUS | Malignant Hyperthermia Association of the United States |
| MHCD | Mission in Health Care and Development |
| MHD | Monkey Helpers for the Disabled |
| MHFA | Mount Holyoke Freethought Alliance |
| MHH | Montgomery Habitat for Humanity |
| MHHC | Manitoba Habitat Heritage Corporation |
| MHN | Men's Health Network |
| MHN | Music Heritage Network |
| MHOF | Mr. Holland's Opus Foundation |
| MHPCO | Michigan Hospice & Palliative Care Organization |
| MHS | Maine Historical Society |
| MHS | Michigan Historical Society |
| MHS | Michigan Humane Society |
| MHS | Minnesota Historical Society |
| MHS | Musical Heritage Society |
| MHSA | Michigan Head Start Association |