| 1951 Five Nations Championship | |
| Date: | 13 January - 7 April 1951 |
| Countries: | |
| Count: | 7 |
| Matches: | 10 |
| Previous Year: | 1950 |
| Previous Tournament: | 1950 Five Nations Championship |
| Next Year: | 1952 |
| Next Tournament: | 1952 Five Nations Championship |
The 1951 Five Nations Championship was the twenty-second series of the rugby union Five Nations Championship. Including the previous incarnations as the Home Nations and Five Nations, this was the fifty-seventh series of the northern hemisphere rugby union championship. Ten matches were played between 13 January and 7 April. It was contested by England, France, Ireland, Scotland and Wales. missed out on a second Grand Slam after drawing against at Cardiff Arms Park, but won the championship.
The teams involved were: