This is a list of petroleum companies.
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 here are the list of the biggest petroleum companies in terms of Oil Reserves , figures in billions of Barrels : "Oil and Gas Reserves by Country or Company" , Data360.
- Abu Dhabi National Oil Company ( ADNOC ), United Arab Emirates
- Addax Petroleum , Switzerland
- 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
- Charottar Gas Sahkari Mandli. , India
- Chevron Corporation , United States
- Citgo , Venezuela
- CNOOC Ltd. , China
- ConocoPhillips , United States
- Crown Central Petroleum , United States
- Cupet , Cuba
- Devon Energy , United States
- Ecopetrol , Colombia
- Emarat , UAE
- Emarat Misr , Egypt
- Enbridge , Canada
- EnCana , Canada
- ENSCO International , United States
- Elinoil Hellenic Petroleum Company S.A., Greece
- Eni , Italy
- Essar Oil , India
- ExxonMobil , United States
- Faroe Petroleum , Faroe Islands
- Galp Energia , Portugal
- Gujarat Oleo Chem Ltd. , India
- Geo Global Resources. , India
- Petronet LNG Limited , India
- Gujarat Gas Co. Ltd. , India
- Gujarat State Petroleum Corporation , India
- Gulf Oil , United States
- Grupa LOTOS , Poland
- Hellenic Petroleum , Greece
- HOECL , India
- Hess Oil Company , USA
- Husky Energy , Canada
- Imperial Oil , Canada
- INA (Industrija Nafte) , Croatia
- Indian Oil Corporation , India
- Insight Energy Corp , United States
- Irving Oil , Canada
- Jubiliant Empro , India
- JHON ENERGY , India
- Kerr-McGee , United States
- Koch Industries , United States
- Kuwait German Petroleum Company , Canada
- The Louisiana Land & Exploration Company , United States
- LUKoil , Russia
- Marathon Oil Corporation , United States
- Maxol Group , Republic Of Ireland
- MedcoEnergi , Indonesia
- Mol Group , Hungary
- Naftna Industrija Srbije , Serbia
- National Iranian Oil Company (NIOC), Iran
- National Oil Corporation , Libya
- Neste Oil , Finland
- Norsk Hydro , Norway
- North Atlantic Petroleum , Canada
- Northern Territory Oil Limited , Australia
- NNPC , Nigeria
- Occidental Petroleum
- Oil & Gas Development Company Limited (OGDCL), Pakistan
- Oil & Gas Petroleum Corporation , United States
- Oil India Limited , India
- OMV , Austria
- ONGC , India
- PKN Orlen S.A. , Poland
- PSO , Pakistan
- Petróleos De Venezuela , Venezuela
- Petroleos Mexicanos , Mexico
- Petro-Canada , Canada
- Petro Peru , Peru
- Petrobras , Brazil
- PetroChina , China
- Petroconpak , Pakistan
- PetroKazakhstan , Canada
- Petron Corporation , Philippines
- PETRONAS , Malaysia
- Petrotrin , Trinidad And Tobago
- Pertamina , Indonesia
- Piyush Petroleum Co. Ltd , India
- Pogo Producing , United States
- Polish Oil And Gas Company , Poland
- Prize Petroleum CO.LTD. , India
- Qatar Petroleum , Qatar
- Reliance Industries Limited , India
- Repsol YPF , Spain
- Rompetrol Group N.V. , Romania
- Royal Dutch Shell , Netherlands , United Kingdom
- 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
- Sonangol , Angola
- Sonatrach , Algeria
- SPC , Singapore
- Statoil , Norway
- State Oil Company Of Azerbaijan , SOCAR Azerbaijan
- Stuart Petroleum Limited , Australia
- Sunoco , United States
- Suncor Energy , Canada
- Surgutneftegaz , Russia
- Syncrude , Canada
- Talisman Energy , Canada
- Teikoku Oil , Japan
- Todd Energy , New Zealand
- Total , France
- Turkish Petroleum Corporation , Turkey
- Turkish Petroleum International Company Limited , Turkey
- Tüpraş , Turkey
- United Petroleum , Australia
- United Refining Company , United States
- Vaalco Energy Inc. , United States
- Van Doren Oil , United States
- Wyngate International, Inc. United States
- Woodside Petroleum , Australia
- YPFB , Bolivia
- YUKOS , Russia
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