Mattias Nilsson (born 19 February 1982 in Brunflo, near ÃÂstersund) is a former Swedish biathlete.
Nilsson retired after the 2010âÂÂ11 season, announcing on 27 September 2011 his retirement from the sport due to a heart condition.
In May 2018, it was announced that he, from the 2018âÂÂ2019 season, becomes coach for Team Sweden in men's cross-country skiing together with Johan Olsson and Fredrik Uusitalo.