Julian Hettwer (born 15 June 2003) is a German professional footballer who plays as a forward for club Fortuna Düsseldorf.
Hettwer made his professional debut for MSV Duisburg on 14 November 2020, in the 3. Liga away match against Türkgücü München. He signed a new contract on 1 June 2021. A new contract was signed on 2 February 2022, running until 2024. In the summer of 2023, he was transferred to Borussia Dortmund II.
On 28 May 2025, Hettwer signed with Fortuna Düsseldorf.