Beau Gadsdon (born January 17, 2007) is a British television and film actress.
As a child actress, she appeared in ' as a young Jyn Erso. She played mini-Harry in the 2017 music video for Harry Styles song Kiwi. She played a young Lisbeth Salander in the 2018 film The Girl in the Spider's Web.
She played Polly Ingram, the daughter of Matthew Macfadyen's Major Charles Ingram in true-life television crime drama Quiz in 2020. She also appeared in the horror film Censor, playing the younger version of Enid, played by Niamh Algar. She appeared in Katherine Ryan comedy series The Duchess for Netflix, and the comedy series The Baby.
In 2021, she played a young Antonia Minor on historical television series Domina. In 2022, she could be seen in Netflix spy thriller Treason. That year, she had the lead role of Lily Watts in The Railway Children Return, a film which also starred Jenny Agutter, and was a sequel to the 1970 film The Railway Children.
In 2023, Gadsdon appeared in series six of The Crown in flashback scenes set on Victory in Europe Day playing a teenage Princess Margaret alongside Viola Prettejohn as the teenage Princess Elizabeth. She had first played the role in series one in 2016.
In 2024, she appeared in the television adaptation of A Gentleman in Moscow starring Ewan McGregor.
She has two younger sisters, one older brother, and two older half-sisters. Her younger sisters, Dolly Gadsdon and Billie Gadsdon have followed her into the world of acting.