| 1981 Five Nations Championship | |
| Date: | 17 January - 21 March 1981 |
| Countries: | |
| Count: | 7 |
| Grand Slam: | (3rd title) |
| Matches: | 10 |
| Tries: | 25 |
| Top Point Scorer: | Dusty Hare (30) |
| Top Try Scorer: | Laurent Pardo (2) Steve Munro (2) |
| Previous Year: | 1980 |
| Previous Tournament: | 1980 Five Nations Championship |
| Next Year: | 1982 |
| Next Tournament: | 1982 Five Nations Championship |
The 1981 Five Nations Championship was the fifty-second series of the rugby union Five Nations Championship. Including the previous incarnations as the Home Nations and Five Nations, this was the eighty-seventh series of the northern hemisphere rugby union championship. Ten matches were played between 17 January and 21 March.
were the winners, winning the championship outright for the eighth time. They had also shared the title on four other occasions. In winning all their four matches they also won the Grand Slam for the third time.
The teams involved were:
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