Kat Sadler is a British comedian, actress, and writer. Sadler was born in 1994 and is from Sutton, London. She has a younger sister, actress Lizzie Davidson. Sadler started in comedy at Warwick University where she studied film and literature. She would write sketches for the comedy society and performing stand up comedy. 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.