This is a selected list of petroleum companies in alphabetical order.
- Assam Company Ltd (ACL), India
- Abu Dhabi National Oil Company (ADNOC), United Arab Emirates
- Alon USA, United States
- Amerada Hess Corporation, United States
- Anadarko Petroleum Corporation, United States
- Apache Corporation, United States
- Arbusto Energy, United States
- Atlantic Petroleum, Faroe Islands
- BG Group, United Kingdom
- Bharat Petroleum Corporation Limited, India
- BHP Billiton, Australia
- BP, United Kingdom
- Cairn Energy, India
- Canadian Natural Resources, Canada
- Chevron Corporation, United States
- Citgo, Venezuela
- CNOOC Ltd., China
- ConocoPhillips, United States
- Cosmo Oil Company, Japan
- Crown Central Petroleum, United States
- Cupet, Cuba
- Devon Energy, United States
- Ecopetrol, Colombia
- Enbridge, Canada
- EnCana, Canada
- ENSCO International, United States
- Eni, Italy
- Essar oil ltd.,India
- Entreprise Tunisienne d'Activites Petroliere (ETAP), Tunisia
- ExxonMobil, United States
- Galp Energia, Portugal
- Petronet LNG Limited, India
- Gujarat Gas Co. Ltd., India
- Gujarat State Petroleum Corporation, India
- Gulf Oil, Luxembourg
- Grupa LOTOS, Poland
- Hellenic Petroleum, Greece
- Hindustan Petroleum Corporation Ltd, India
- Husky Energy, Canada
- IB Daiwa, Japan
- Imperial Oil, Canada
- INA - Industrija Nafte, Croatia
- Indian Oil Corporation, India
- Inpex, Japan
- Irving Oil, Canada
- Japan Energy, Japan
- Kerr-McGee, United States
- Koch Industries, United States
- Kuwait German Petroleum Company, Canada
- LUKoil, Russia
- Marathon Oil Corporation, United States
- Maxol Group, Republic of Ireland
- MedcoEnergi, Indonesia
- Mol Group, Hungary
- Naftna Industrija Srbije, Serbia
- Naftohaz Ukrainy, Ukraine
- National Iranian Oil Company (NIOC), Iran
- National Oil Corporation, Libya
- Neste Oil, Finland
- Nippon Oil, Japan
- NNPC,Nigeria
- Northern Resources[1],Canada
- Oil & Gas Development Company Limited[2], Pakistan
- Occidental Petroleum
- Oil India Limited, India
- Oman Oil Company (OOC), Oman
- OMV, Austria
- ONGC, India
- PKN Orlen S.A., Poland
- PSO, Pakistan
- Petróleos de Venezuela, Venezuela
- Petroleos Mexicanos, Mexico
- Petro-Canada, Canada
- Petrobras, Brazil
- PetroChina, China
- PetroKazakhstan, Canada
- Petrom, Romania
- Petron Corporation, Philippines
- PETRONAS, Malaysia
- PETROTRIN, Trinidad and Tobago
- Pertamina, Indonesia
- Polish Oil and Gas Company, Poland
- Qatar Petroleum, Qatar
- Reliance Industries Limited, India
- Repsol YPF, Spain
- Rompetrol Group N.V., Romania
- Royal Dutch Shell, Netherlands, United Kingdom
- San-Ai Oil, Japan
- Santos Limited, Australia
- Sasol, South Africa
- Saudi Aramco, Saudi Arabia (the largest in the world)
- Shell Canada, Canada (subsidiary of Royal Dutch Shell)
- Shell Oil Company, United States (subsidiary of Royal Dutch Shell)
- Sinclair Oil, United States
- Sinopec, China
- Snpc, Congo-Brazzaville
- Sonangol, Angola
- Sonatrach, Algeria
- SPC, Singapore
- StatoilHydro, Norway
- State Oil Company of Azerbaijan, SOCAR Azerbaijan
- State Oil Company of Suriname, Suriname
- Sunoco, United States
- Suncor Energy, Canada
- Surgutneftegaz, Russia
- Syncrude, Canada
- Talisman Energy, Canada
- Todd Energy, New Zealand
- Total, France
- United Refining Company, United States
- Vaalco Energy Inc., United States
- Wintershall, Germany
- Woodside Petroleum, Australia
- YPFB, Bolivia
- YUKOS, Russia
