The 2000 Summer Olympic Games, officially known as the Games of the XXVII Olympiad and commonly known as Sydney 2000 or the Millennium Olympic Games/Games of the New Millennium, were an international multi-sport event which was held between 15 September and 1 October 2000 in Sydney, New South Wales, Australia. It was the second time that the Summer Olympics were held in Australia, and also the Southern Hemisphere, the first being in Melbourne, Victoria, in 1956.

Sydney was selected as the host city for the 2000 games in 1993. Teams from 199 countries participated. The United States won the most medals with 93, while Australia came in 4th with 58. The games cost was estimated to be A$6.6 billion. The Games received universal acclaim, with the organisation, volunteers, sportsmanship and Australian public being lauded in the international media. Bill Bryson from The Times called the Sydney Games "one of the most successful events on the world stage", saying that they "couldn't be better".

James Mossop of the Electronic Telegraph called the Games in an article "such a success that any city considering bidding for future Olympics must be wondering how it can reach the standards set by Sydney", while Jack Todd in the Montreal Gazette suggested that the "IOC should quit while it's ahead. Admit there can never be a better Olympic Games, and be done with it", as "Sydney was both exceptional and the best".

In preparing for the 2012 Olympic Games in London, Lord Coe declared the Sydney Games the "benchmark for the spirit of the Games, unquestionably" and admitting that the London organising committee "attempted in a number of ways to emulate what the Sydney Organising Committee did." These were the final Olympic Games under the IOC presidency of Juan Antonio Samaranch. These were also the second Olympic Games to be held in spring.

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