Justin Diehl (born 27 November 2004) is a German professional footballer who plays as a forward for club VfB Stuttgart.
On 7 August 2020, Diehl signed his first professional contract with FC Köln until 2023. He made his professional debut for Köln on 21 January 2023.
On 22 May 2024, VfB Stuttgart announced that they had signed Diehl on a five-year-contract. He officially joined on 1 July 2024.
Born in Germany, Diehl is of Ghanaian descent. He is a youth international for Germany, having played up to the Germany U19s.