Rebecca Langrehr (born 4 April 1998) is a German born modern pentathlete who represents the United States since September 2025.
She participated at the 2018 World Modern Pentathlon Championships, winning a medal.
In September 2025 she announced that the German Federation DVMF does not support her anymore and she even lost her status as a sport soldier in the German Army, so she accepted an invitation of the US Federation to represent the USA in the future. https://www.spiegel.de/sport/moderner-fuenfkampf-weltmeisterin-rebecca-langrehr-wechselt-nach-streit-in-die-usa-a-9f35fc60-a52b-466f-978b-02bfd3cb120b