The 2009 Six Nations Championship, known as the RBS 6 Nations for sponsorship reasons, was the 10th Six Nations Championship, and the 115th international championship, an annual rugby union competition contested by the six major European national teams: England, France, Ireland, Italy, Scotland and Wales. The tournament was held between 7 February and 21 March 2009.

The Six Nations Championship is an annual international men's rugby union competition between the teams of England, France, Ireland, Italy, Scotland and Wales. It is also the oldest sports tournament ever between Home Nations. The championship holders are Ireland, who won the 2024 tournament.