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List of companies by size of oil reserves
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A list of the largest petroleum companies is always somewhat arbitrary as state-owned companies operate differently to private-owned ones. As of April 2007[update] here are the list of the biggest petroleum companies in terms of oil reserves, figures in billions of barrels:[1]

* Saudi Arabian Oil Company 295
* National Iranian Oil Company 287
* Qatar Petroleum 165
* Abu Dhabi National Oil Company 137
* Iraq National Oil Company 137
* Gazprom 115
* Kuwait Petroleum Corporation 107
* Petróleos de Venezuela S.A. 102
* Nigerian National Petroleum Corporation 62
* National Oil Corporation (Libya) 45
* Sonatrach 40
* Rosneft 35

[edit] Alphabetical list of companies

This is a selected list of petroleum companies in alphabetical order.

* Assam Oil Company Ltd. (ACL), India
* Abu Dhabi National Oil Company (ADNOC), United Arab Emirates
* AinMine Petroleum
* 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
* Buzachi Petroleum Operating, Kazakhstan
* BP, United Kingdom
* Cairn Energy, India
* Canadian Natural Resources, Canada
* Chevron Corporation, United States
* Chief Oil and Gas, United States
* Citgo, Venezuela
* CNOOC Ltd., China
* ConocoPhillips, United States
* Cooper Energy, Australia
* Cosmo Oil Company, Japan
* Crown Central Petroleum, United States
* Cupet, Cuba
* Devon Energy, United States
* Ecopetrol, Colombia
* Edoardo Raffinerie Garrone, Italy
* Enbridge, Canada
* EnCana, Canada
* Energopetrol, Bosnia
* ENSCO International, United States
* Eni, Italy
* ENX, Switzerland
* ENXRU, Russia
* Essar oil ltd., India
* Entreprise Tunisienne d'Activites Petroliere (ETAP), Tunisia
* Eser Corporation, United States
* ExxonMobil, United States
* First Texas Energy Corporation, United States
* Galp Energia, Portugal
* Petronet LNG Limited, India
* Gujarat Gas Co. Ltd., India
* Gujarat State Petroleum Corporation, India
* Gulf Oil, Luxembourg
* Greka Energy, United States
* Grupa LOTOS, Poland
* HryJax Petroleum
* Hellenic Petroleum, Greece
* Hess Corporation, United States
* 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
* Kaz-Munay Gaz, Kazakhstan
* Karazhanbas Munay, Kazakhstan
* Kerr-McGee, United States
* Koch Industries, United States
* Kuwait German Petroleum Company, Canada
* Kuwait Gulf Oil Company, Kuwait
* Kuwait National Petroleum Company Kuwait.
* Kuwait Oil Company, Kuwait
* Kuwait Petroleum Corporation, Kuwait
* LUKoil, Russia
* M3nergy Gamma SDN. BHD., Malaysia
* Marathon Oil Corporation, United States
* Maurel & Prom, France
* mari Gas Company Limited, pakistan
* Maxol Group, Republic of Ireland
* MedcoEnergi, Indonesia
* Mol Group, Hungary
* Naftna Industrija Srbije, Serbia
* Naftogas of Ukraine, Ukraine
* National Iranian Oil Company (NIOC), Iran
* National Oil Corporation, Libya
* Neste Oil, Finland
* Nexen, Canada
* Nippon Oil, Japan
* NNPC, Nigeria
* Oil Planet International Corp [www.oilplanetinternationalcorp.com],[United States]
* Northern Resources[1], Canada
* Oil and Gas Development Company Limited[2], Pakistan
* Occidental Petroleum, United States
* 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
* PetroAlam, Egypt
* Petroleum Development Oman,(PDO)
* Perenco, France, United Kingdom
* Petro-Canada, Canada
* Petrobras, Brazil
* PetroChina, China
* PetroKazakhstan, Kazakhstan
* Petrom, Romania
* Petron Corporation, Philippines
* PETRONAS, Malaysia
* PETROTRIN, Trinidad and Tobago
* PetroVietnam, Vietnam
* Pertamina, Indonesia
* Polish Oil and Gas Company, Poland
* Plains Exploration & Production Company (PXP), United States
* PTT Public Company Limited, Thailand
* Qatar Petroleum, Qatar
* Reliance Industries Limited, India
* Repsol YPF, Spain
* Rompetrol Group N.V., Romania
* Royal Dutch Shell, Netherlands, United Kingdom
* Sagiz Petroleum, Kazakhstan
* 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
* Singapore Petroleum Company, Singapore
* StatoilHydro, Norway
* State Oil Company of Azerbaijan, SOCAR Azerbaijan
* Somerset Refinery, United States.
* 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
* Tullow Oil, United Kingdom
* United Refining Company, United States
* Vaalco Energy Inc., United States
* Wintershall, Germany
* Woodside Petroleum, Australia
* XTO Energy, United States
* YPF, Argentina
* YPFB, Bolivia