Olof Mattias Jonsson (pronounced [maˈtîːas ˈjʊ̌nːsɔn]; born 16 January 1974) is a Swedish former professional footballer who played as a winger.

Starting off his career with Örebro SK in the early 1990s, he went on to represent Helsingborgs IF, Brøndby IF, and Norwich City before retiring at Djurgårdens IF in 2011.

He was brought in by Brøndby's new manager Åge Hareide, and Jonson played several games as a striker, before settling as a left-sided winger.

In the return game, Jonson scored a hat-trick which guided Brøndby to a 5–0 victory and advancement in the tournament, on a 6–3 aggregate.

[1] He was Brøndby's league topscorer with 11 goals in the 2002–03 Superliga season, and helped the club win the 2003 Danish Cup trophy.

In August 2004, he moved to England and joined the newly promoted Premier League side Norwich City.