Mathias Tønnessen is a professional footballer from NOR and is currently 23 years old. He is on the books of Tromso IL and wears shirt number 3. His main role on the pitch is Defender. He measures 189cm in height and weighs 78kg. His estimated market valuation currently stands at 1000K €.

His latest transfer saw him join Tromso IL from KFUM Oslo via Free on 2026-01-30. The move was reported at 1.1M €.

Across the Norwegian Eliteserien 2025, Mathias Tønnessen appeared in 29 matches and averaged 2.6 tackles, 1.3 interceptions, 5.6 clearances, and 0.1 blocked shots per game.