Leon Klassen

Leon Klassen (born 29 May 2000) is a professional footballer who plays as a left-back for Austrian Football Bundesliga club Grazer AK on loan from German club SV Darmstadt. Born in Germany, he has represented Russia at various youth levels. Klassen made his professional debut in the 3. Liga for 1860 Munich on 31 July 2019, coming on as a substitute in the 87th minute for Benjamin Kindsvater against FSV Zwickau. He assisted Herbert Paul for Munich's third goal, with the match finishing as a 3–0 home win.

On 27 May 2021, he signed with WSG Tirol in Austria.

On 30 December 2021, he signed a 3.5-year contract with Russian Premier League club FC Spartak Moscow.

Klassen was born in Germany to a Russian father and a German mother.