Sport in Cardiff is dictated by, amongst other things, its position as the capital city of Wales, meaning that national home sporting fixtures are nearly always played in the city. All of Wales' multi-sports agencies and many of the country's sports governing bodies have their headquarters in Cardiff and the city's many top-quality venues have attracted world-famous sport events, sometimes unrelated to Cardiff or to Wales.
The city hosts numerous international sporting events, be it independently or on behalf of Wales or the United Kingdom. Rugby fans around the world have long been familiar with the Cardiff Arms Park and its successor the Millennium Stadium, a visible presence from in and around the city. Early this century, hundreds of thousands of English football and rugby league supporters visited Cardiff during the six years (from 2001 to 2006) it took to rebuild Wembley Stadium, as the FA Cup and Rugby League Challenge Cup finals (and several other competitions) were played at the Millennium Stadium. In 2009, Cardiff hosted the first Ashes cricket test, between England and Australia, to be held in Wales. Cardiff hosted eight football matches of the London 2012 Olympics and was the training base for certain participating nations.
In 2008/09, 61% of Cardiff residents regularly participated in sport and active recreation, the highest percentage out of all 22 local authorities in Wales.
Cardiff plays host to many high-profile sporting events at a local, national and international level. In recognition of the city's commitment to sport for all, Cardiff was awarded the title of European City of Sport 2009. Organised sports have been held in the city since the early 19th century.Cardiff Arms Park (Welsh: Parc yr Arfau Caerdydd), in central Cardiff, is among the world's most famous venues—being the scene of three Welsh Grand Slams in the 1970s (1971, 1976 and 1978) and six Five Nations titles in nine years—and was the venue for Wales' games in the 1991 Rugby World Cup. The Arms Park has a sporting history dating back to at least the 1850s, when Cardiff Cricket Club (formed 1819) relocated to the site. The ground was donated to Cardiff CC in 1867 by the Marquess of Bute. Cardiff Cricket Club shared the ground with Cardiff Rugby Football Club (founded 1876)—forming Cardiff Athletic Club between them—until 1966, when the cricket section moved to Sophia Gardens. Cardiff Athletic Club and the Welsh Rugby Union established two stadia on the site—Cardiff RFC played at their stadium at the northern end of the site, and the Wales national rugby union team played international matches at the National Stadium, Cardiff Arms Park, which opened in 1970. The National Stadium was replaced by the 74,500 capacity Millennium Stadium (Welsh: Stadiwm y Mileniwm) in 1999—in time for the 1999 Rugby World Cup—and is home stadium to the Wales national rugby and football teams for international matches. In addition to Wales' Six Nations Championship and other international games, the Millennium Stadium held four matches in the 2007 Rugby World Cup and six FA Cup finals (from the 2000–01 to 2005–06 seasons) while Wembley Stadium was being rebuilt.