The Millennium Summit was a meeting among many world leaders, lasting three days from 6 to 8 September 2000, held at the United Nations headquarters in New York City. Its purpose was to discuss the role of the United Nations at the turn of the 21st century. At the meeting, world leaders ratified the United Nations Millennium Declaration. This meeting was the largest gathering of world leaders in history as of 2000. It was followed five years later by the World Summit, which took place from 14 to 16 September 2005.

The 2005 World Summit was a United Nations summit held between 14 and 16 September 2005 at the U.N. headquarters in New York City. It was a follow-up summit meeting to the U.N.'s 2000 Millennium Summit.