Xu Huihui (Chinese: 徐慧慧; pinyin: Xúhuìhuì; born February 9, 1986) is an actress and former competitive wushu taolu athlete who lives in the United States. She is a three-time world champion and is one of the most renowned athletes to represent a European country at the World Wushu Championships. In her acting career, she is best known for portraying Helen Takahama / Widow in the Marvel Cinematic Universe films Black Widow and Shang-Chi and the Legend of the Ten Rings (both 2021).