National oil company

A national oil company (NOC) is an oil company fully or in the majority owned by a national government. According to the IMF, NOCs had a share of around 50% in 2005 global oil production and a share of over 70% in global oil reserves.

Major NOCs include:
Saudi Arabian Oil Company (Aramco) (Saudi Arabia)
National Iranian Oil Company (NIOC) (Iran)
Egyptian General Petroleum Corporation (EGPC) (Egypt)
Empresa Colombiana de Petróleos S.A. (Colombia)
National Oil Corporation Libya (Libya)
Oil and Natural Gas Corporation India (India)
Petroleos Mexicanos (Mexico)
Petroleos de Venezuela (Venezuela)
China National Petroleum (PetroChina) (China)
Nigerian National Petroleum Company (Nigeria)
Iraq National Oil Company (Iraq)
Kuwait Petroleum Corporation (Kuwait)
Pertamina (Indonesia)
Petrobras (Brazil)
Petroleum Development Oman (Oman)
Abu Dhabi National Oil Company (Abu Dhabi)
Emirates National Oil Company (Dubai)
Petronas (Malaysia)
Rosneft (Russia)
Sinopec (China)
Gazprom (Russia)
StatoilHydro (Norway)
Sonatrach (Algeria)

source: http://en.wikipedia.org/wiki/National_oil_company#cite_note-IMF-0