Aljoscha Kemlein (born 2 August 2004) is a German professional footballer who plays as a defensive midfielder for Bundesliga club Union Berlin.

On 1 September 2022, he signed his first professional contract with Union Berlin.

[2] He made his senior and professional debut with Union Berlin as a late substitute in a 4–1 Bundesliga win over Mainz on 20 August 2023.

[3] On 7 January 2024, Union Berlin sent Kemlein on loan to 2.

Bundesliga club FC St. Pauli until the end of the season.