| CWT Ltd | United Kingdom | Engineering and Fabrication |
| Cyril Bath (Covered by ACB - France) | United States | Aerospace |
| Cytec Austria GmbH (Covered by Cytec Surface Specialties SA/NV - Belgium) | Austria | Aerospace |
| Cytec Surface Specialties Inc (Covered by Cytec Surface Specialties SA/NV - Belgium) | United States | Aerospace |
| Cytec Surface Specialties SA/NV | Belgium | Aerospace |
| D C White & Partners Ltd | United Kingdom | Engineering and Fabrication |
| Daewoo Shipbuilding & Marine Engineering Co Ltd (DSME) | Korea - Republic Of (South) | Engineering and Fabrication |
| Dage Precision Industries Limited | United Kingdom | Electronics and Sensors |
| Daido Steel Co Ltd | Japan | Equipment Consumables and Materials |
| Danfoss Commercial Compressors | France | Engineering and Fabrication |
| Danfoss Industrial Automation (Covered by Danfoss Refrigeration and Air Conditioning Division - Denmark) | Denmark | Electronics and Sensors |
| Danfoss Poland Sp. z o.o. (Covered by Danfoss Refrigeration and Air Conditioning Division - Denmark) | Poland | Electronics and Sensors |
| Danfoss Refrigeration & Air Conditioning Controls (Covered by Danfoss Refrigeration and Air Conditioning Division - Denmark) | Denmark | Electronics and Sensors |
| Danfoss Refrigeration and Air Conditioning Division | Denmark | Electronics and Sensors |
| Danfoss Refrigeration Equipments Tianjin Co. Ltd (Covered by Danfoss Refrigeration and Air Conditioning Division - Denmark) | China | Electronics and Sensors |
| Daniel Europe (Covered by Emerson Electric - Europe - United Kingdom) | United Kingdom | Equipment Consumables and Materials |
| Dansk Shell A/S Raffinaderiet (Covered by Shell UK Ltd - United Kingdom) | Denmark | Oil and Gas |
| Darchem Engineering Ltd | United Kingdom | Aerospace |
| Datapaq Ltd | United Kingdom | Electronics and Sensors |
| DAU Ges.m.b.H & Co KG (Covered by EBG & DAU Kühlerentwicklung GmbH - Austria) | Austria | Engineering and Fabrication |
| DAU Thermal Solutions North America (Covered by EBG & DAU Kühlerentwicklung GmbH - Austria) | United States | Engineering and Fabrication |
| Daventry Metal Products Ltd | United Kingdom | Equipment Consumables and Materials |
| Davy Process Technology Ltd | United Kingdom | Oil and Gas |
| DavyMarkham Ltd | United Kingdom | Engineering and Fabrication |
| Dawson Downie Lamont (Covered by Proclad Group - United Arab Emirates) | United Kingdom | Oil and Gas |
| DCNS Propulsion | France | Power |
| Deeside Power Limited (Covered by International Power - UK Power Generation Operations - United Kingdom) | United Kingdom | Power |
| Defence Aviation Repair Agency (Covered by Ministry of Defence - United Kingdom) | United Kingdom | Aerospace |
| Defence Clothing & Textiles Agency (Covered by Ministry of Defence - United Kingdom) | United Kingdom | Engineering and Fabrication |
| Defence Equipment & Support (DE & S) (Covered by Ministry of Defence - United Kingdom) | United Kingdom | Engineering and Fabrication |
| DEKRA Industrial GmbH | Germany | Power |
| Delphi Automotive Systems LLC (Covered by Delphi Electronics & Safety - United States) | United States | Automotive |
| Delphi Electronics & Safety | United States | Automotive |
| Den Norske Stats Oljeselskap AS (Covered by Statoil ASA - Norway) | Norway | Oil and Gas |
| Denso Marston Ltd | United Kingdom | Automotive |
| Department for Transport (DfT) | United Kingdom | Engineering and Fabrication |
| DePuy International Ltd | United Kingdom | Medical |
| Det Norske Veritas | Norway | Oil and Gas |
| Det Norske Veritas (USA) Inc (Covered by Det Norske Veritas - Norway) | United States | Oil and Gas |
| Det Norske Veritas As Sdn Bhd (Covered by Det Norske Veritas - Norway) | Malaysia | Oil and Gas |
| Det Norske Veritas Classification AS (Covered by Det Norske Veritas - Norway) | Norway | Oil and Gas |
| Det Norske Veritas Industry (Covered by Det Norske Veritas - Norway) | United States | Oil and Gas |
| Det Norske Veritas Industry Pte Ltd (Covered by Det Norske Veritas - Norway) | Singapore | Oil and Gas |
| Det Norske Veritas Research AS (Covered by Det Norske Veritas - Norway) | Norway | Oil and Gas |
| Det Norske Veritas Vietnam (Covered by Det Norske Veritas - Norway) | Vietnam | Oil and Gas |
| Deva Manufacturing Services Ltd (Covered by BNS Nuclear Services Ltd - United Kingdom) | United Kingdom | Power |
| Devonport Royal Dockyard Limited | United Kingdom | Engineering and Fabrication |
| Dhuruma Electricity Company | Saudi Arabia | Power |
| Diamond Detectors Ltd (Covered by Element Six Group - United Kingdom) | United Kingdom | Electronics and Sensors |
| Diffusion Alloys Ltd | United Kingdom | Power |
| DNV (Covered by Det Norske Veritas - Norway) | Norway | Oil and Gas |
| DNV Inspection AB (Covered by Det Norske Veritas - Norway) | Sweden | Oil and Gas |
| DNV KEMA Energy & Sustainability (Covered by Det Norske Veritas - Norway) | Netherlands | Power |
| DNV Nigeria Limited (Covered by Det Norske Veritas - Norway) | Nigeria | Oil and Gas |
| DNV Veritec (Covered by Det Norske Veritas - Norway) | Norway | Oil and Gas |
| DNV/KKA (Covered by Det Norske Veritas - Norway) | Malaysia | Oil and Gas |
| Dolphin Energy Ltd | Qatar | Oil and Gas |
| Domino UK Limited | United Kingdom | Electronics and Sensors |
| Dongyang Gangchul Co Ltd | Korea - Republic Of (South) | Engineering and Fabrication |
| Doosan Power Systems Limited | United Kingdom | Power |
| Dow Corning Ltd | United Kingdom | Oil and Gas |
| Dragon LNG (Covered by BG Group - United Kingdom) | United Kingdom | Oil and Gas |
| Drakensberg Power Station (Covered by ESKOM Holdings Limited - South Africa) | South Africa | Power |
| DSM | Netherlands | Oil and Gas |
| DSM - Sitech Services (Covered by DSM - Netherlands) | Netherlands | Oil and Gas |
| DSM Agro (Covered by DSM - Netherlands) | Netherlands | Oil and Gas |
| DSM Corporate SHE&M (Covered by DSM - Netherlands) | Netherlands | Oil and Gas |
| DSM Elastomers (Covered by DSM - Netherlands) | Netherlands | Oil and Gas |
| DSM Fibre Intermediates (Covered by DSM - Netherlands) | Netherlands | Oil and Gas |
| DSM Industrial Services BV (Covered by DSM - Netherlands) | Netherlands | Oil and Gas |
| DSM NeoResins (Covered by DSM - Netherlands) | Netherlands | Oil and Gas |
| DSM United Kingdom Ltd (Covered by DSM - Netherlands) | United Kingdom | Oil and Gas |
| DSTL (Covered by Ministry of Defence - United Kingdom) | United Kingdom | Engineering and Fabrication |
| DSTO (Australian Government) | Australia | Engineering and Fabrication |
| DUCO Ltd (Covered by Technip - France) | United Kingdom | Oil and Gas |
| Dunlop Oil & Marine Ltd | United Kingdom | Oil and Gas |
| Dunlop Oil & Marine Ltd (Covered by Dunlop Oil & Marine Ltd - United Kingdom) | United Kingdom | Oil and Gas |
| Dutch Space BV | Netherlands | Aerospace |
| Duvha Power Station (Covered by ESKOM Holdings Limited - South Africa) | South Africa | Power |
| Dyson Ltd | United Kingdom | Electronics and Sensors |
| e2v Technologies Plc | United Kingdom | Electronics and Sensors |
| Eastern Petrochemical Company (SHARQ) (Covered by SABIC - Saudi Arabia) | Saudi Arabia | Oil and Gas |
| EBG & DAU Kühlerentwicklung GmbH | Austria | Engineering and Fabrication |
| EBTEC Corporation | United States | Equipment Consumables and Materials |
| ECAPS (Ecological Advanced Propulsion Systems) | Sweden | Aerospace |
| Eclipse Scientific | Canada | Equipment Consumables and Materials |
| Edbro plc | United Kingdom | Engineering and Fabrication |
| EDF CIDEN (Covered by EDF SA - France) | France | Power |
| EDF CIT (Covered by EDF SA - France) | France | Power |
| EDF Energy Nuclear Generation Ltd | United Kingdom | Power |
| EDF Energy/EDF R&D (Covered by EDF Energy Nuclear Generation Ltd - United Kingdom) | United Kingdom | Power |
| EDF Nuclear Engineering Division - SEPTEN (Covered by EDF SA - France) | France | Power |
| EDF R&D (Covered by EDF SA - France) | France | Power |
| EDF SA | France | Power |
| EDF UNIE (Covered by EDF SA - France) | France | Power |
| EDF UTO (Covered by EDF SA - France) | France | Power |
| EDO MBM Technology Ltd | United Kingdom | Aerospace |
| Electro Arco (Covered by Lincoln Electric Europe SL - Netherlands) | Portugal | Electronics and Sensors |
| Electro-Motive Diesel Inc (Covered by Caterpillar Inc - United States) | United States | Engineering and Fabrication |
| Electron Beam Processes Ltd | United Kingdom | Equipment Consumables and Materials |
