Kat Sadler is a British comedian, actress, and writer. She is best known for writing and starring in the BBC Three comedy drama Such Brave Girls.
Sadler was born in 1994 and is from Sutton, London. She has a younger sister, actress Lizzie Davidson, who also plays her sister in Such Brave Girls. Sadler's family experienced financial struggles whilst she was growing up, and she describes the family environment as "tempestuous".
Sadler studied film and literature at Warwick University. Whilst there, she would write sketches for the comedy society and perform stand up comedy.
Sadler is her stage name with Davidson being her family name. She began using the name "Kat" after she took it from Julia Stiles' character in 10 Things I Hate About You.
In 2019, Sadler was awarded the BBC comedy writing bursary and became the in-house comedy writer for BBC Studios.
Sadler was a writer on The Mash Report and won the BBC Radio Comedy Writers Bursary in 2019. Her writing credits also include Joe Lycett's Got Your Back for Channel 4, The Jonathan Ross Show for ITV, Newsjack for BBC Radio 4 Extra and Frankie Boyle's New World Order for BBC Two, The Now Show and The News Quiz for BBC Radio 4, and Hypothetical and Mel Giedroyc: Unforgivable for Dave.
At the start of 2020, Sadler had deteriorating mental health, experiences she drew from for the BBC Three and Hulu sitcom Such Brave Girls (2023) which she wrote and starred in alongside her real life sister Lizzie Davidson.
Discussing the 2021 pilot episode, Sadler said that:<blockquote>"everything we joke about in the show is from a place of lived experience. I wish I could say this is a heart-warming show about overcoming trauma, but that would be a lie. ItâÂÂs about three toxic, damaged egomaniacs manipulating the world and each other for their own personal gain, vengeance and gloryâ¦just like in Little Women." </blockquote>At the start of filming the series in 2023, Sadler described the show as âÂÂa family sitcom about trauma, but itâÂÂs more about us being narcissistic losers who are pathetically obsessed with what people think about us.âÂÂ
At the 2026 Sadler nominated for writing and the series was again nominated for scripted comedy.
Sadler has twice been nominated for the BBC New Comedian of the Year award.
Sadler is queer.
Sadler has experience of mental health issues. The idea for Such Brave Girls came out of her experience of calling her sister from from hospital and told her sheâÂÂd been sectioned after twice trying to take her own life, and her sister responded by revealing she was ã20,000 in debt, then they both laughed. When the first series came out, Sadler lost her best friend to suicide, which "gave me real fire to talk about it [the mental health system]"