| Acronym | Definition |
|---|
| Merc | Mercury |
| Merc | Mercedes Benz |
| Merc | Mercenary (gaming, Flyff) |
| Merc | Middle East Rally Championship (International Automobile Federation) |
| Merc | Maharashtra Electricity Regulatory Commission (India) |
| Merc | Mercury Dime (issued 1916 to 1945) |
| Merc | Michigan Employment Relations Commission |
| Merc | Mercian (linguistics) |
| Merc | Metropolitan Exposition-Recreation Commission |
| Merc | Middle East Regulatory Conference |
| Merc | Mercer Engineering Research Center |
| Merc | Medical Effectiveness Research Center (University of California, San Francisco) |
| Merc | Mandatory Employment Related Costs (Canada) |
| Merc | Medical Equipment Repair Center |
| Merc | National Centre for Research in Music Education and Sound Arts (University of Canterbury; New Zealand) |
| Merc | Morgantown Energy Research Center (US Department of Energy) |
| Merc | Mobile Emissions Reduction Credit |
| Merc | Marine Environment Research Center |
| Merc | Malaysian Economic Research Corporation |
| Merc | Mobility Enhancing Ration Components |
| Merc | Marine Extension and Research Center |
| Merc | Minority Economic Resources Corporation |
| Merc | Medical Education Reserach Committee (various organizations) |
| Merc | Merged Emergency Response Center (US Air Force) |