The Group of Eight (G8) is a forum for the governments of eight large economies. (It excludes some members of the actual eight largest, such as China, Brazil and India). The forum originated with a 1975 summit hosted by France that brought together representatives of six governments: France, Germany, Italy, Japan, the United Kingdom, and the United States, thus leading to the name Group of Six or G6. The summit became known as the Group of Seven or G7 the following year with the addition of Canada. In 1997, Russia was added to group which then became known as the G8. The European Union is represented within the G8 but cannot host or chair summits.

"G8" can refer to the member states in aggregate or to the annual summit meeting of the G8 heads of government. The former term, G6, is now frequently applied to the six most populous countries within the European Union. G8 ministers also meet throughout the year, such as the G7/8 finance ministers (who meet four times a year), G8 foreign ministers, or G8 environment ministers.