1991 Five Nations Championship

The 1991 Five Nations Championship was the 62nd series of the Five Nations Championship, an annual rugby union competition between the major Northern Hemisphere rugby union national teams. The tournament consisted of ten matches held between 19 January and 16 March 1991.

The tournament was the 62nd in its then format as the Five Nations. Including the competition's former incarnation as the Home Nations Championship, the 1991 Five Nations Championship was the 97th Northern Hemisphere rugby union championship.

The championship was contested by England, France, Ireland, Scotland and Wales. England won the tournament, achieving a final 21–19 victory over France to win the Grand Slam, their first since 1980 and ninth overall in the Five Nations. This was also their nineteenth outright victory, including five victories in the Home Nations, excluding ten titles shared with other countries. England also won the Triple Crown and Calcutta Cup as a result of their victories over the other Home Nations. France and Scotland placed second and third with three and two wins respectively, while Ireland and Wales placed fourth and fifth without achieving any victories; the fixture between the two teams resulted in a 21–21 draw.