In rugby union, the Triple Crown is an honour contested annually by the "Home Nations" – i.e. England, Ireland, Scotland, and Wales who compete within the larger Six Nations Championship. If any one of these teams defeat all three other teams, they win the Triple Crown.

The 2006 Six Nations Championship was the seventh series of the rugby union Six Nations Championship to be held since the competition expanded in 2000 to include Italy. Including the previous incarnations as the Home Nations and Five Nations, this was the 112th series of the northern hemisphere rugby union championship. This was the fourth edition sponsored by Royal Bank of Scotland.