Mathias Tønnessen (born 22 November 2003) is a Norwegian footballer who plays as a centre-back for Eliteserien side Tromsø.
Career KFUM Oslo Tønnessen came through Skeid's youth setup, before transferring to KFUM Oslo at the age of fifteen. Although he played as a winger early in his career, he changed to playing as a centre-back in 2022.
After playing the 2022 season almost exclusively in the Norwegian Fourth Division for KFUM's second team, first team head coach Johannes Moesgaard chose to move Tønnessen to the first team ahead of the 2023 season. Here, Tønnessen would get his breakthrough, playing most of the games in the league that season, which ended with promotion for KFUM and Tønnessen. In September 2023, Nettavisen had Tønnessen tenth on their list of the ten biggest talents in the Norwegian First Division.
Tønnessen signed a new three-year contract with the club in January 2024 ahead of his first season in the Eliteserien. Only five games into the 2024 season, in a game against Sarpsborg 08, Tønnessen sustained a meniscus injury, that would keep him out of play until December, when he was subbed on in the final game of the season. After his injury the previous season, Tønnessen returned for the 2025 season, playing twenty-nine out of thirty games in the league.
Tromsø On 2 January 2026, Tromsø announced that they had signed Tønnessen, on a five-year deal. The deal was reported to cost Tromsø around €1,100,000, setting a new transfer fee record for Tromsø. Tromsø's interest went back several years, and a previous bid during the summer transfer window in 2023 had been rejected by KFUM Oslo.
International career In October 2023, Tønnessen was called up to the Norway U20 team for their games against Czechia and Romania. He started the game against Romania, before being subbed off in the 82nd minute.
Personal life Tønnessen is the son of former Norwegian record holder in the triple jump, Lene Espegren Tønnessen. His father Espen Tønnessen was a coach in the same sport, working for Olympiatoppen. Mathias Tønnessen is nicknamed "Tønna", literally "The Barrel", though derived from his name not from his slender stature.
Career statistics
+ Appearances and goals by club, season and competitionClubSeasonLeagueNational CupEuropeTotalDivisionAppsGoalsAppsGoalsAppsGoalsAppsGoalsKFUM Oslo 22019Norwegian Fourth Division10——102021Norwegian Fourth Division51——512022Norwegian Fourth Division235——2352023Norwegian Third Division20——20Total316——316KFUM Oslo2022Norwegian First Division1030—402023Norwegian First Division27030—3002024Eliteserien5000—502025Eliteserien29050—340Total620110—730Tromsø2026Eliteserien600050110Career total996110501156
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