The are many oil companies located around the world. Many of the largest oil companies are actually state (government) owned. In fact, companies such as ExxonMobile and BP are not even in the top 15 oil companies, a fact that most people in the western world don't know.

Top 50 Oil Companies (by reserves)

01 National Iranian Oil Company (Iran)
02 Saudi Arabian Oil Company (Saudi Arabia)
03 Iraq National Oil Company (Iraq)
04 Qatar General Petroleum Corporation (Qatar)
05 Abu Dhabi National Oil Company (UAE)
06 Kuwait Petroleum Corporation (Kuwait)
07 Petroleos de Venezuela.S.A. (Venezuela)
08 Nigerian National Petroleum Corporation (Nigeria)
09 National Oil Company (Libya)
10 Sonatrach (Algeria)
11 Gazprom (Russia)
12 PetroChina Co. Ltd. (China)
13 OAO Rosneft (Russia)
14 Petronas (Malaysia)
15 OAO Lukoil (Russia)
16 Petroleos Mexicanos (Mexico)
17 ExxonMobil Corporation (United States)
18 BP Corporation (United Kingdom)
19 Egyptian General Petroleum Corp. (Egypt)
20 Chevron Corporation (United States)
21 ConocoPhillips (United States)
22 Total (France)
23 Petroleum Development Oman LLC (Oman)
24 Petroleo Brasilerio S.A. (Brazil)
25 Royal Dutch/Shell (Netherlands)
26 Sonangol (Angola)
27 ENI (Italy)
28 Dubai Petroleum Company (United Arab Emirates)
29 Petroleos de Ecuador (Ecuador)
30 Pertamina (Indonesia)
31 Statoil (Norway)
32 EnCana Corp. (Canada)
33 Anadarko Petroleum Corporation (United States)
34 Occidental Petroleum Corporation (United States)
35 China National Offshore Oil Corp. (China)
36 Repsol YPF (Spain)
37 Devon Energy Corporation (United States)
38 Apache Corp. (United States)
39 Ecopetrol (Columbia)
40 Canadian Natural Resources (Canada)
41 Norsk Hydro ASA (Norway)
42 Talisman Energy Ltd. (Canada)
43 Romanian National Oil Co. (Romania)
44 BG Group PLC (United Kingdom)
45 BHP Billiton Ltd (Australia)
46 Petro-Canada (Canada)
47 Hess Corp. (United States)
48 Nexen Inc. (Canada)
49 Shell Canada Ltd. (Canada)
50 Canadian Oil Sands Trust (Canada)