Stefan Posch is a defender who plays for Mainz 05 in the Bundesliga. He was born on 14 May 1997 in Judenburg, Austria.
He began his senior career at Admira Wacker Amateure in 2013, and he went on to play for TSG Hoffenheim, Bologna, Atalanta and Como. Mainz 05 signed him in 2025.
Posch has represented Austria at youth international level.
Since his first senior season in 2013/14, Posch has made 284 club appearances and scored 15 goals in all competitions for 6 clubs. His most productive season in front of goal was 2022/23, when he scored 6 times in 33 games for TSG Hoffenheim and Bologna. His busiest campaign was 2025/26, with 34 appearances. So far in 2026/27 he has made 3 appearances for Mainz 05. The full season-by-season record is in the Stats section of this profile.