| Al-Ajjaj Limited Co. W.L.L (AALCO) | ABN Contracting | ADCC Joint Venture |
| AES Ras Laffan Operating Company WLL | Afrina Trading & Contracting Co. | AKC Contracting |
| Aktor, Qatar | Al Aali International | Al Alia Trading & Contracting |
| Al Arrab Contracting Company | Al Bader for Services Export Import & Contracting | Al Balagh Trading & Contracting |
| Al Bandary Engineering, Trading & Cont. | Al Borouq for Advanced Construction | Al Daicel Trading and contg |
| Al Darwish Engineering | Al Finiqia Trading & Contracting | Al Fowriya Trading & Contracting WLL |
| Al Futtaim Carillion (Abu Dhabi) LLC | Al Habtoor Engineering Enterprises Co. | Al Hamed Development & Construction |
| Al Hassan International Trading & Contracting | Al Huda Engineering Works | Al Jaber and Partners |
| Al Jaber Energy Services, Qatar; | Al Jaber Engineering L.L.C | Al Jaber Partners Construction & Energy Projects WLL |
| Al Jaber Trading & Contracting Company | Al Jaber Transport & General Contracting | Al Kaabi Contracting & Trading |
| Al Khaleej Building Company | Al Khayarin Group Trading & Contracting | Al Madar |
| Al Majal Trading and Construction Co. | Al Mass Commercial Contracting | Al Muftah Contracting |
| Al Mullah Eng. & Construction | Al Musairie Tradg. & Cont. | Al Mushrif Trading & Contracting Co. |
| Al Obeidly & Gulf Eternit | Al Seal Trading & Contracting | Al Sraiya Trading & Contracting Company |
| Al Waha Transport, Maint. & Cont. Co. WLL | Al Yusr Townsend & Bottum Qatar Co. Ltd. | Alcat Contracting |
| Amana Steel Building & Cont Co. WLL | American Qatari French Trading & Contracting (Afqco ) | Amiantit Qatar Pipes Co Ltd |
| Ammico Trad & contracting | Arab Engineering Bureau | Arabtec Construction Co. WLL |
| Archirodon Construction (Overseas) | Associate Consulting Engineer | Astaldi Arabia |
| Australian Construction Technology | Bab Ishtar Group | Badr Contracting & Trading |
| Badr-El Hazek Qatar WLL | BAS Engineering Trading & Contracting | Baytur Construction and Cont. Co. |
| Beijing Urban Construciton co | Bemco Contracting Co. Qatar W.L.L | Bilfinger Berger Qatar WLL |
| Bin Omran Trading and Contracting WLL | Black Cat Engineering & Construction | Boom Construction Co. |
| BURC Group Qatar | Buzwair Engineering & Contracting | Cansult Maunsell |
| Carillion (Qatar) LLC | CAT International Qatar W.L.L | CCC/TCC Joint Venture |
| CDC Takenaka | CFE Middle East | Charilaos Apostilides (Chapo), Qatar |
| Chicago Bridge & Iron (CB&I),Qatar | China Railway Construction Corporation, China; | China state Engineering Construction |
| Chip International | Chiyoda Corporation/HHI Company | Chiyoda/Technip |
| CICO Middle East | Classic Trading & Services | CMC Qatar |
| Commodore Qatar Contracting Co. | Como | Conmix Ltd |
| Consolidated Contractors International Company (CCC), Qatar | Construction & Reconstruction Engineering Company (CRC) | Construction Development Co. |
| Contrack International Inc. | Contraco | Cybarco |
| Daewoo E & C Co. Ltd | Damac Contracting | Danem Engineering Works |
| Danway Qatar | Darwind | Descon Engineering Qatar W. L. L. |
| Dodsal Engineering & Construction Pte Ltd | Doha Petroleum Construction Co. Ltd. | El-Seif Engineering Contracting |
| EMCO Qatar | Energy Technical Services | ETA Engineering |
| ETA Star Construction | Eversendai Engineering Qatar | Ezdan Real Estate |
| FBA Engineering & Contracting | Flora International Trading & Services Co. | Freyssinet Menard Qatar WLL |
| Galfar Al Misnad | Gama Qatar Co. W.L.L. | Gamuda WCT Joint Venture |
| General Trading Group | Geoson Construction Dynamics | Gettco Contracting |
| GHD | Green Top International | Gulf Cement Company |
| Gulf Contracting Co. WLL | Gulf East Trading & Contracting | Gulf Housing & Construction Company |
| Gulf Precast Company | Gulf Steel & Engineering | Gusan Construction Co. Ltd |
| Halcrow Ltd. | Hamad Medical Corporation | Hasan Juma Backer Trading & Cont. |
| Hassanco Trading & Contracting Company | HBK Contracting Co. W.L.L. | HBK Engineering Services |
| Higgs & Hill Qatar | HKH Contracting | Hochtief |
| Honeywell | How United Services | Hyodong Development Co. Ltd. |
| Hyosung Ebara Engineering co. ltd | Hyundai Engineering & Construction Co. Ltd. | Iberdrola Middle East |
| Imco | Industrial Services Group; | Insdustrial Const. And Eng’g Company |
| Inshaa Contracting Company | Integrated Technical Group Company | Integration Construction & Building |
| International Decor & Contracting Company; | International Trading & Contracting | J Ray McDermott, Dubai |
| James Cubitt & Partners Engineering | JGC Middle East FZE | Joannou and Paraskevaides |
| Jotun | KBAS Cont.Trdg & Industrial Co. LLC | KBS Trading & Contracting |
| Kentz Overseas Limited, Qatar | KEO International Consultants | Keppel Seghers Engineering Singapore Pte Ltd |
| Kettaneh Construction Co. | khalid Cement Factory | Khatib & Alami Consolidated Engg. Co. |
| Khatib & Alami Consolidated Engineering Company | Kittco Contracting | Larsen & Toubro, Qatar |
| Leighton Contracting Qatar W. L. L. | Linde Engineering | Linde, Abu Dhabi |
| Lotus Trading and Contracting Company | Man Enterprises Qatar | Marbu Electrical & Contracting Co. |
| Mercury Engineering; | Midmac Contracting | Multiplex Medgulf WLL |
| Mushrif Trading & Contracting Co. | Nael and Bin Harmal Hydro | Nasser S. Al-Hajri Co. Ltd. |
| National Contracting & Trading | National Industrial Contracting Co. WLL | National Petroleum Construction Company (NPCC), Abu Dhabi |
| OHL Contract joint venture | Orientals Enterprises WLL | Parsons |
| Peninsular Petrotech Engineering WLL | Petrofac International, Qatar | PETROSERV Limited |
| Power Line Engineering Qatar | Punj Lloyd Ltd | Qatar Aircraft Catering Company |
| Qatar Al-Attiyah International Group | Qatar Arab Contractors | Qatar Building Company |
| Qatar Building Company | Qatar Chemical Co. Ltd | Qatar Civil and Trading Development |
| Qatar Co. | Qatar Design Consortium | Qatar Engineering & Construction Company |
| Qatar Fertiliser Company | Qatar Foundation | Qatar Fuel (WOQOD) |
| Qatar Indo Fabs | Qatar International Supply | Qatar Kentz |
| Qatar Petrochemical Co.Ltd. | Qatar Precast Co. | Qatar Trading & Contracting Group |
| Qatar Vinyl Company Ltd. Q.S.L | Qatari Arabian Construction Co. | Qatari Development Trading & Contracting Company |
| QDVC | Ramco Trading & Contracting | Ras Gas Company Limited |
| Real Estate Construction Company | Redco Construction – Al Mana | Redco International |
| Rivera Trading & Contracting | Rizzani de Eccher, Qatar | Royal Abjer Trading & Contracting Co. |
| Rumaillah Services | Saipem | Salam Enterprises |
| Satco International | SEG Qatar | Select Glass industries LLC |
| Shanghai Construction Group Gulf | Shanoon Engineering | Shapoorji Pallonji Qatar WLL |
| Shaqab Abela Catering Services Co. WLL | SIEMENS | Sika |
| Simplex Infrastructures Ltd. | Sinohydro Corporation | Sixcontruct Midmac JV |
| Sky Oryx JV | Spartan Trading & Contracting | STRABAG Qatar |
| Subenko Gulf Engineering | Tadmur Contracting & Trading Est. | TAG Engineering |
| Technip-Coflexip | Tekfen, Qatar; | Terna GEK Group, Qatar |
| Teyseer Trading & Contracting | Toyo Engineering Corp., Qatar; | TRAGS |
| Trags Electrical Eng’g & Air Conditioning | TRAMARCO | Uhde |
| Ultra Construction Company | United Construction Establishment | United Prescat |
| UPC | Voltas Ltd. | Wai Fong Qatar |
| Washington Group International; | WCT Engineering Berhad, Dubai | Wintershall, Germany |
| Zublin International |
