Marius Söderbäck (born 6 February 2004) is a Finnish professional football player who plays as a midfielder for Veikkausliiga side Ilves.

Söderbäck played in the youth sectors of Nurmijärven Jalkapalloseura (NJS), HJK Helsinki and Käpylän Pallo (KäPa).

On 7 August 2023, Veikkausliiga club Ilves announced the signing of Söderbäck from KäPa for an undisclosed fee.

[1][2][3][4] On 31 July 2024, Söderbäck scored his first goal for Ilves, in a 2024–25 UEFA Conference League qualifying match against Austria Wien away, helping his side to advance to the third round of the competition by an aggregate win.

[7] He received his first call-up for the Finland U21 national team in September 2024, when he was named in the squad for the 2025 UEFA U21 Euro qualifying matches against Armenia and Romania as a replacement to Juho Talvitie, but remained an unused substitute.