The G20 or Group of 20 is an intergovernmental forum comprising 19 sovereign countries, the European Union, and the African Union. It was founded in 1999 in response to several world economic crises and works to address major issues related to the global economy, such as international financial stability, climate change mitigation, and sustainable development. The G20 is composed of most of the worlds largest economies finance ministries, including both industrialized and developing countries; it accounts for around 80% of gross world product (GWP), 75% of international trade, two-thirds of the global population, and 60% of the worlds land area. Since 2008, it has convened at least once a year, with summits involving each members head of government or state, finance minister, or foreign minister, and other high-ranking officials; the EU is represented by the European Commission and the European Central Bank.

The members of the G20 are Argentina, Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, Republic of Korea, Mexico, Russia, Saudi Arabia, South Africa, Turkey, the United Kingdom, the United States, and the European Union. These countries represent around 85% of the global GDP, over 75% of the global trade, and about two-thirds of the world population.

In summary, the G20 countries are:

1. Argentina
2. Australia
3. Brazil
4. Canada
5. China
6. France
7. Germany
8. India
9. Indonesia
10. Italy
11. Japan
12. Republic of Korea
13. Mexico
14. Russia
15. Saudi Arabia
16. South Africa
17. Turkey
18. United Kingdom
19. United States
20. European Union