The Chess World Cup is the name given to a number of different chess tournaments. The format and significance of the tournaments has changed over the years.
In 1988–89, the Grandmasters Association organised a series of six high-ranking World Cup tournaments in the form of a 'Grand Prix'.
In 2000 and 2002 FIDE, the World Chess Federation, staged their "First Chess World Cup" and "Second Chess World Cup" respectively. These were major tournaments, but not directly linked to the World Chess Championship. Both the 2000 and 2002 events were won by Viswanathan Anand of India.
Since 2005, a different event of the same name has been part of the World Chess Championship cycle. This event is being held every two years. It is a 128-player knockout tournament, in the same style as the Tilburg tournament from 1992-94, or the 1998, 1999, 2000, 2002 and 2004 FIDE World Championships.
The event was held in 2005, 2007, 2009, and 2011 in Khanty-Mansiysk, and subsequently FIDE has given preference to bids for the Olympiad that also contain a bid for the preceding World Cup. During the 2015 finals of the World Cup, the main organizer commented "We received the right to host the Olympiad and then we were given an additional event – the World Cup."
The Chess World Cup 2005 qualified ten players for the Candidates Tournament for the World Chess Championship 2007. This event was won by Armenian GM Levon Aronian. The Chess World Cup 2007 qualified one player for the next stage of the World Chess Championship 2010. This event was won by American GM Gata Kamsky.