Stefanie Rennoch (née Zwitkowitsch; born 14 April 1976) is a German professional darts player who plays in Professional Darts Corporation (PDC) events.Her biggest achievement to date was qualified for 2022 PDC Women's Series semi-finals and winning a silver medal at the WDF World Cup.

Rennoch has been taking part in German tournaments and various World Darts Federation (WDF) competitions since 2013, with more than remarkable success.

In December, she successfully participated in the 2016 Winmau World Masters, where she lost 3–4 in the fifth round match to Corrine Hammond and missed the television stage of that tournament.

In 2017, she advanced for the first time to final of the World Darts Federation tournament Police Masters and lost in decider leg 4–5 to Ramona Eriksen.

In 2022, she returned to competing at the international level, this time taking part in Professional Darts Corporation (PDC) tournaments for ladies.