Constantin Preis (born 16 May 1998) is a German athlete specialising in the 400 metres hurdles. He represented his country at the 2019 World Championships in Doha without advancing from the first round.
His personal best in the event was 49.23 seconds set in Zürich in 2019, he improved it to 48.60 at Centre sportif Bout-du-Monde, in Geneva (SUI) on 12 June 2021.
Born in Moldova, Preis moved to Germany at the age of 11.