Jessie Cave

Cave was born on 5 May 1987 in London, the second of five siblings. Her father works as a general practitioner. Her mother Deborah is the daughter of former Chief Secretary to Hong Kong, Tasmanian-born Sir Charles Philip Haddon-Cave. Her youngest sister Bebe Cave is also an actress.

She attended Latymer Upper School in Hammersmith for Sixth Form. A former county-level swimmer and ex-national tennis player, she studied illustration and animation at Kingston University, dropping out aged 19. Her tennis career was cut short by injury when she was 15. In 2020, she revealed that she had been raped by her tennis coach at the age of 14. She had originally intended to study stage management at the Royal Academy of Dramatic Arts, and worked in London as a stagehand, before deciding to pursue acting.Cave made her acting debut in the drama Summerhill, shown on CBBC in early 2008.

She won the role of Lavender Brown in the film Harry Potter and the Half-Blood Prince through an open casting call held on 1 July 2007. Cave, who came from an agency, beat over 7,000 girls who turned up for the audition. She also performed the voice of Lavender in the video-game adaptations of Harry Potter and the Half-Blood Prince and Harry Potter and the Deathly Hallows: Part 2.

In June 2009, she made her West End début, playing Thomasina in a revival of Tom Stoppard's Arcadia at the Duke of York's Theatre. That December, Cave had a minor role in the 2009 film Inkheart as a water nymph.

She appeared in the play Breed at Theatre503, playing the role of Liv, from 21 September to 16 October 2010. She won the Off West-End stage award for People's Choice for Female Performance.

On 4 February 2011, she appeared as a one-off character, Hermione, on the CBBC children's drama Sadie J.

Cave runs the website Pindippy, and its associated YouTube channel of the same name, which features short videos written by and starring Cave herself, with occasional appearances from some of her Harry Potter costars, including her close friend, Evanna Lynch.

She played the title character in a 2012 production of J. M. Barrie's Mary Rose at the DogOrange Theatre, in London. That same year, she appeared as Zazzy in the final episode of season 2 of Grandma's House, which aired on 24 May 2012, and in the role of Elder Biddy in 2012's Great Expectations, based on the novel by Charles Dickens and directed by Mike Newell. During the filming of Great Expectations, Cave worked alongside her younger sister Bebe (who played the younger Biddy) and was also reunited with her Harry Potter costars Helena Bonham Carter, Robbie Coltrane, and Ralph Fiennes. By June 2012, Cave had amassed over 30,000 followers on her Twitter account.

Cave has had several minor television roles. She appeared as a waitress named Angela in a medieval restaurant in the second series of BBC Three's Pramface, which aired on 8 January 2013. She appeared as Theodora Snitch, a character in YouTube's one-off revival of the TV series Knightmare; as Denise in episode 2 of Coming Up Series 8; as Alicia Ferguson on the CBBC series Wizards vs Aliens, in the two-part episode "The Thirteenth Floor"; as Anne-Marie Bonner in series 2 of The Job Lot; and as Annie Maddocks in the E4 drama Glue in 2014. She has appeared as herself on game shows, including 8 Out of 10 Cats Does Countdown in 2017 and Richard Osman's House of Games in November 2021.

In August 2012, Cave made her debut at the Edinburgh Festival Fringe with her show Bookworm, which is described as "a charming hour of character comedy and loving literary silliness inspired by the obsessive Potter fans" Cave encountered while starring in the Harry Potter films. In the show, Cave stars as the bossy leader of a book club named Bookworms United, whose sidekick is played by her younger sister, Bebe. Cave's character expresses her enthusiasm for topics ranging from Babar to Andre Agassi's autobiography through a combination of homemade props and shadow puppetry, which conceal the character's neurosis and contrast with a subplot about an ex-boyfriend.

Her 2018 Edinburgh Fringe show Sunrise was described as an "emotionally intelligent [and] honest" performance. and has since been published as a playtext by Nick Hern Books. She also does regular comedy shows at venues in Soho, London.