Madeline Woo (born 1998) is an American ballet dancer. Since 2025, she has been a principal dancer for San Francisco Ballet, and was previously a principal dancer for the Royal Swedish Ballet. She is known for her deviation from normal ballet dancer aesthetics, and has founded her own fashion brand, Maddwoo Studios.
Woo grew up in Huntington Beach, California, and in her youth, she trained at V and T Dance in Laguna Hills. While a freshman at Huntington Beach High School, Woo won the Los Angeles Regionals of the Youth America Grand Prix (YAGP) in 2014. She went on to reach the final round of the YAGP finals and earn a one year scholarship at the John Cranko School in Stuttgart. She attended a ballet boarding school in Sweden. She won the Prix de Lausanne in 2015.
Woo joined the Royal Swedish Ballet in 2017, and was promoted to principal in 2022. In 2025, she departed the Royal Swedish Ballet to become a principal dancer for San Francisco Ballet. Explaining the move, Woo said: "The older I get, the more comfortable I get". Writing for the San Francisco Chronicle, critic Rachel Howard described Woo's Spring 2026 season-opening performance of Stars and Sripes as having "space-devouring split jumps and saut de chat".
Describing herself as "that ballerina with the tattoos", Woo has described herself as "rebellious" against traditional ballet aesthetics, having never felt fully comfortable in traditional ballet attire, choosing instead a "grungier" look. Tattoos have historically been considered taboo in ballet, and Woo must cover hers for performances.
In 2025, Woo founded Maddwoo Studios, a fashion brand based in Sweden.