| Man Force Trading & Contracting Company | Services |
| Manasco Trading W.L.L | Conglomerates |
| Mandriva Group Qatar | Construction |
| Mannai Air Travel | Leisure and Tourism |
| Mannai Corporation Q.S.C. | Transport |
| Mansion Trading & Contracting W.L.L | Industrial Manufacturing |
| Manweir W.L.L. | Industrial Manufacturing |
| Maples Safety & Industrial Solutions WLL | Transport |
| Maples Safety & Industrial Solutions WLL Qatar | Construction |
| Marafeq Qatar Company | Power and Utilities |
| Marbu Contracting Company W.L.L. | Construction |
| Marriott Marquis City Center Doha Hotel | Leisure and Tourism |
| Mars Trading & Contracting Company | Consumer Goods |
| Marshal Shipping & Logistics | Transport |
| Marubeni | Power and Utilities |
| 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 |
