Sebastian Fiedler (born 19 June 1973 in Herdecke) is a German politician of the SPD who has been serving as a Member of the German Bundestag for Mülheim – Essen I since 2021.

Fiedler was born in Herdecke and grew up in Wetter.

Before entering politics, Fiedler formerly worked as a police officer.

Since the 2025 elections, Fiedler has been his parliamentary group's spokesperson on internal affairs.