| 1949 Five Nations Championship | |
| Date: | 15 January - 26 March 1949 |
| Countries: | |
| Count: | 6 |
| Triple Crown: | (4th title) |
| Matches: | 10 |
| Previous Year: | 1948 |
| Previous Tournament: | 1948 Five Nations Championship |
| Next Year: | 1950 |
| Next Tournament: | 1950 Five Nations Championship |
The 1949 Five Nations Championship was the twentieth series of the rugby union Five Nations Championship. Including the previous incarnations as the Home Nations and Five Nations, this was the fifty-fifth series of the northern hemisphere rugby union championship. Ten matches were played between 15 January and 26 March. It was contested by England, France, Ireland, Scotland and Wales. Ireland won their 6th title and the Triple Crown.
The teams involved were: