| Mazaya Qatar Real Estate Development Q.S.C | Real Estate |
| McNair Chambers - Qatar | Services |
| MCT Pest Control | Services |
| MEBS International | Services |
| Mechanical Electrical Plumbing Enterprises W.L.L. | Construction |
| Mechanical Engineering Workshop Company WLL | Industrial Manufacturing |
| MechaTronics W.L.L | Construction |
| Mechel Engineering W.L.L | Construction |
| MedEsole W.L.L. | Health Care |
| Medgulf Construction Company (W.L.L.) | Construction |
| Media Point Advertising Trading Company | Media |
| Medicare Group Q.S.C. | Health Care |
| MEEZA QSTP LLC | Information Technology |
| Mega E&M Trading and Contracting L.L.C. | Construction |
| Mega Rent a Car | Transport |
| Megapro services Trading & Contracting | Conglomerates |
| Megatec Electro Mechanical Engineers & Contractors WLL | Construction |
| Memar Trading & Contracting Company | Construction |
| Mercure Grand Hotel Doha | Leisure and Tourism |
| Mercury Mena Electromechanical | Construction |
| Mesaieed Bakery | Food and Beverages |
| Mesaieed Petrochemical Holding Company Q.S.C. | Oil and Gas |
| Metal Arabia Trading & Contracting Company W.L.L. | Industrial Manufacturing |
| Micron Facility Management | Services |
| Middle East Building Materials Company W.L.L | Industrial Manufacturing |
