| MASA Group Qatar | Conglomerates |
| Masa Lifts | Industrial Manufacturing |
| Masraf Al Rayan (Q.P.S.C.) | Financial Services |
| Massoun Insurance Services L.L.C. | Financial Services |
| Master Consultant Engineers | Construction |
| Matrix International Contracting Company W.L.L. | Services |
| Mayan Design | Construction |
| Mayhoola for Investment LLC | Financial Services |
| Maysaloon Engineering | Industrial Manufacturing |
| Mazars Ahmed Tawfik & Company Certified Public Accountants | Financial Services |
| 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 |
