| Arabian Construction Engineering Company | Construction |
| Arabian Controls | Conglomerates |
| Arabian Deutch Contracting Co (ADCO) | Conglomerates |
| Arabian Establishment for Commerce | Media |
| Arabian Exchange Company W.L.L | Financial Services |
| Arabian MEP Contracting W.L.L. | Construction |
| Arabian Supply Center WLL | Transport |
| Arabian Technical Services Company LLC | Construction |
| Arbaah Financial Consultancy WLL | Services |
| Arbab Servetech | Industrial Manufacturing |
| ARBRIT SAFETY & ENGINEERING SOLUTION | Education |
| Arc de Triomphe | Construction |
| Arctic Cooling Company | Construction |
| Argon Global W.L.L. | Telecommunications |
| Argus Technologies W.L.L | Information Technology |
| Art Glass Company WLL | Industrial Manufacturing |
| Artan Holding | Education |
| ARVEX VR QSTP LLC | Information Technology |
| ASAS for Industrial Projects | Industrial Manufacturing |
| Asia Electro Mechanical Company W.L.L | Industrial Manufacturing |
| Asia Tech Engineering & Contracting W.L.L | Construction |
| Asian Insulation Company Qatar W.L.L. | Construction |
| Askar Industries Company W.L.L | Industrial Manufacturing |
| Aspetar | Health Care |
| Aspetar Qatar Orthopaedic and Sports Medicine Hospital | Health Care |
