The Commonwealth Games is a multinational, multi-sport event which features competitions involving thousands of elite athletes (sportsperson) from members of the Commonwealth of Nations. Organised every four years, they are the third-largest multi-sport event in the world, after the Summer Olympic Games and the Asian Games.

As well as many Olympic sports, the Games also include some sports that are played mainly in Commonwealth countries, such as lawn bowls, rugby sevens, gymnastics and netball. The Games are overseen by the Commonwealth Games Federation (CGF), which also controls the sporting programme and selects the host cities. The host city is selected from across the Commonwealth, with eighteen cities in seven countries having hosted it.

The event was first held in 1930 under the title of the British Empire Games. The event was renamed as the British Empire and Commonwealth Games in 1954, the British Commonwealth Games in 1970, and gained its current title in 1978. Only six teams have attended every Commonwealth Games: Australia, Canada, England, New Zealand, Scotland and Wales. Australia has been the highest scoring team for ten games, England for seven and Canada for one.

There are currently 54 members of the Commonwealth of Nations, and 71 teams participate in the Games. The four Home Nations of the United Kingdom - England, Scotland, Wales and Northern Ireland - send separate teams to the Commonwealth Games (unlike at the Olympic Games, where the United Kingdom sends a single team), and individual teams are also sent from the British Crown dependencies (crown dependency) - Guernsey, Jersey and the Isle of Man - and many of the British overseas territories. The Australian external territory of Norfolk Island also sends its own team, as do the Cook Islands and Niue, two states in free association (Associated state) with New Zealand.

The most recent games were in 2006 (2006 Commonwealth Games) in Melbourne, Australia. The next edition will be held in 2010 (2010 Commonwealth Games) in Delhi, India.