the 1985 five nations championship was the fifty-sixth series of the rugby union five nations championship. including the previous incarnations as the home nations and five nations, this was the ninety-first series of the northern hemisphere rugby union championship. ten matches were played between 2 february and 20 april. the championship was contested by england, france, ireland, scotland and wales. the championship winner was ireland, winning their tenth title (excluding eight other shared titles); it would prove to be their last in 24 years, until their grand slam in 2009. ireland also claimed the triple crown, their sixth, which would be their last until 2004.