Fabienne Königstein (née Amrhein; born 25 November 1992) is a German Marathon and long-distance runner.

To focus on her particular talent for running, Königstein joined the Track and Field Team of Christian Stang at MTG Mannheim in 2006 at the age of 13.

On her first appearance at European Marathon Championships in Berlin 2018, Königstein placed 11th, being the most successful German Athlete in this race.

In December, Königstein concluded the season with a bronze medal at the SPAR European Cross-Country Championships in Tilburg.

After a 18-months injury lay-off, Fabienne Königstein had a comeback in October 2020 at the World Half Marathon Championships in Gdynia, Poland, where she won the bronze medal with Team Germany.