| 2005 Six Nations Championship | |||
|---|---|---|---|
 Wales playing France on 26 February 2005 | |||
| Date | 5 February – 19 March 2005 | ||
| Countries |  England France Ireland Italy Scotland Wales | ||
| Tournament statistics | |||
| Champions | Wales (23rd title) | ||
| Grand Slam | Wales (9th title) | ||
| Triple Crown | Wales (18th title) | ||
| Matches played | 15 | ||
| Tries scored | 71 (4.73 per match) | ||
| Top point scorer(s) | Ronan O'Gara (60) | ||
| Top try scorer(s) | Mark Cueto (4) | ||
| Player of the tournament | Martyn Williams | ||
| |||
The 2005 Six Nations Championship was the sixth Six Nations Championship played since the competition expanded in 2000 to include Italy. Including the Home Nations and Five Nations Championships, this was the 111th season of the tournament.
Wales won the Grand Slam, their first since 1978, and in doing so became the first team ever to win a Grand Slam playing more games away than at home.