成立時間/ 1999年
成員數量/ 20個成員國

總幹事（國籍）/ 無

起源於亞洲金融危機，19個已開發國家和開發中國家，加上歐盟財務長、中央銀行行長，湊在一起討論全球經濟、財政金融等議題。1999年，由G8（當時俄羅斯還在裡頭）提議創建一個更大的國際經濟合作論壇，G20 因應而生。根據統計，G20的GDP總量佔全球GDP的85%，貿易額佔全球貿易總額的80%以上，人口佔全球人口的2/3。
G20誕生後，逐漸取代G7的經濟作用，也間接使得G7轉為討論外交、軍事、氣候變遷等全球議題。G20每年會舉辦一次財長及央行行長會議，以及一場領袖峰會。這些峰會也會固定邀請東協、非洲聯盟、國際貨幣基金會等國際組織共同參與。

Year of Establishment: 1999

The G20 emerged amidst the 1997 Asian financial crisis. Its members include 19 developed and developing countries plus the EU, whose finance ministers and central bank directors meet to discuss issues regarding the global economy and finance. In 1999, the G8 proposed establishing an international economic cooperation forum of a larger scale and this, thus, gave birth to the G20. According to statistics, the G20 members account for 85% of global GDP, over 80% of total international trade volume, and two-thirds of the global population. 

The birth of the G20 gradually replaced the economic purposes of the G7, inadvertently turning the G7 into a forum primarily dedicated to discussion of global issues relating to diplomacy, military campaigns, and climate change. Each year, the G20 holds a meeting of finance ministers and central bank directors, and a summit for heads of governments or state. These summits are also regularly participated in by international organizations such as ASEAN, the African Union, and the International Monetary Fund.