The Six Nations Championship is an annual international rugby union competition involving six European sides: England, France, Ireland, Italy, Scotland and Wales. It is sponsored by the Royal Bank of Scotland. The current champions are Ireland, having won the 2015 Tournament.

The Six Nations is the successor to the Five Nations Championship (1910–31 and 1947–99) which in turn succeeded the Home Nations Championship (1883–1909 and 1932–39). The Home Nations Championship, played between teams from England, Ireland, Scotland and Wales, was the first international rugby union tournament. The winners of the Six Nations Championship are sometimes unofficially referred to in the media as the European Champions or Northern Hemisphere Champions. Ireland are the 2015 champions, having finished on equal table points with Wales and England but winning the trophy by virtue of achieving a higher match points difference.