Matias Tamminen (born 21 November 2001) is a Finnish professional footballer who plays as a winger for Allsvenskan club Öster.
Born in Kotka, Tamminen started playing football in a youth sector of his hometown club Kotkan Työväen Palloilijat (KTP).
[3] On 17 December 2020, fellow Veikkausliiga side FC Inter Turku announced the signing of Tamminen on a three-year deal, and immediately thereafter loaned him back to KTP for the 2021 season.
[4][5] In July 2022, Tamminen represented Inter Turku in UEFA Europa Conference League qualifiers.
On 18 December 2024, Tamminen signed with Allsvenskan club Östers IF, starting in January 2025.