Worldwide
National Oil Companies (government owned)
- Abu Dhabi National Oil Co. (ADNOC)
- China National Offshore Oil. (CNOOC)
- China National Petroleum Corp. (CNPC)
- Chinese Petroleum Corp. [Taiwan]
- Dansk Olie og Naturgas AS (DONG) [Denmark]
- Egyptian General Petroleum Corp. (EGPC)
- Empresa Colombiana de Petroleos (Ecopetrol) [Colombia]
- Empresa Nacional del Petroleo (ENAP) [Chile]
- Fortum Oy [Finland]
- Gazprom [Russia]
- Japan Petroleum Exploration
- Kuwait Petroleum Corp. (KPC)
- Myanmar Oil & Gas Enterprise [Myanmar (Burma)]
- National Iranian Oil Co. (NIOC)
- Nigerian National Petroleum Corp [Nigeria]
- Oil & Natural Gas Corp. Ltd. (ONGC) [India]
- Pertamina [Indonesia]
- Petroleo Brasilerio SA (Petrobras)
- Petroleos del Ecuador (PetroEcuador)
- Petroleos del Peru (Petroperu)
- Petroleos de Venezuela SA (PDVSA)
- Petroleos Mexicanos (PEMEX)
- Petroleum Co. of Trinidad and Tobago Ltd. (Petrotrin)
- Petroleum Development Oman LLC
- Petroleum Exploration & Production Authority (PEPA) [Yemen]
- Petronas [Malaysia]
- PTT Exploration & Production Public Co. Ltd. (PTTEP) [Thailand]
- Qatar Petroleum Corp
- Rompetrol [Romania]
- Saudi Arabian Oil Co. (Saudi Aramco)
- Sonangol [Angola]
- Sonatrach [Algeria]
- State Oil Co. of Suriname Ltd. (Staatsolie)
- Statoil ASA [Norway]
- Turkiye Petrolleri Anonim Ortakligi (TPAO) [Turkey]
- PetroVietnam
Global Oil Companies (Multinationals)
- BP plc
- Chevron Corp.
- ConocoPhillips Co.
- ENI SpA
- ExxonMobil Corp.
- Hess Corp.
- Marathon Oil Corp.
- Murphy Oil Corp.
- Occidental Petroleum Corp.
- Petro-Canada
- Shell (Royal Dutch/Shell Group)
- Total
Others Oil Related Companies
- Baytex Energy Ltd.
- BG Group
- BHP Billiton Ltd.
- Cairn Energy plc
- Canadian 88 Energy Corp.
- Canadian Natural Resources Ltd.
- EnCana Corp.
- Energy Africa
- FX Energy
- Husky Energy Inc.
- Ivanhoe Energy
- Lukoil Oil Co.
- Lundin Petroleum AB
- Mosaic Oil N.L.
- Navigo Energy Inc.
- Nexen Inc.
- New Zealand Oil & Gas Ltd.
- Norsk Hydro ASA
- OMV AG
- Paramount Resources Ltd.
- Penn West Petroleum Ltd.
- PetroKazakhstan
- Premier Oil plc
- Ramco Energy plc
- Repsol YPF
- Santos Ltd.
- Sherritt International Corp.
- Summit Resources
- Talisman Energy Inc.
- Tap Oil Ltd.
- Tullow Oil plc
- Vanco Energy Co.
- Vermilion Resources Ltd.
- Yukos Oil Co.
