| MHAC | Maharaja Harisingh Agri Collegiate 
| Others |
| MHAC | Manufactured Housing Association of Canada
| Others |
| MHAC | Mark Hopkins Accountability Committee
| Others |
| MHAC | Maryland Hospital Acquired Conditions
| Others |
| MHAC | Mental Health Act Commission
| Others |
| MHAC | Mental Health Addiction Conference
| Others |
| MHAC | Mental Health Advisory Committee
| Others |
| MHAC | Mental Health America of California
| Others |
| MHAC | Mental Health Association in California
| Others |
| MHAC | Mental Health Awareness Club
| Others |
| MHAC | Mental Health Awareness Committee
| Others |
| MHAC | Midwest Hispanic AIDS Coalition
| Others |
| MHAC | Migration Health Assessment Centre
| Others |
| MHAC | Miniature Horse Association of Canada
| Others |
| MHAC | Minor Hockey Association of Calgary
| Others |
| MHAC | Minority Health Advisory Council
| Others |
| MHAC | Mississippi Health Access Collaborative
| Others |
| MHAC | Morgan Hill Athletic Club
| Others |
| MHAC | Mt Hood Athletic Club
| Others |