Isabelle Lucy Allen (born 16 March 2002) is an English stage and screen actress known for her role as the young Cosette in the 2012 film adaptation of Les Misérables. The role earned her critical acclaim and various film cast awards such as the National Board of Review Award for Best Cast and the Satellite Award for Best Cast – Motion Picture.
Career Allen was discovered by Jeremy James Taylor, head of the British National Youth Music Theatre after seeing her in the play The Pied Piper in Eastbourne, East Sussex, her hometown. She made her professional debut in the 2012 film Les Misérables as the younger version of Amanda Seyfried's character Cosette, which earned her the Young Artist Award for Best Supporting Young Actress Age Ten and Under. She was later cast in the same role in the West End stage production of the show. She continued in the show until March 2013, sharing her role with Lois Ellington, Ashley Goldberg and Sarah Huttlestone. From July to September 2013, Allen played Brigitta Von Trapp in The Sound of Music, sharing her role with Imogen Gurney and Ava Merson O'Brien. She has also appeared in Hetty Feather, a CBBC drama.
Personal life Her parents are Elaine and Nigel Allen.
Filmography Film + Year Title Role Notes 2012 Les Misérables Young Cosette 2015 Lady of Csejte Aletta Released as Blood Countess in the UK 2016 The Contract Casey Let's Be Evil Cassandra In Extremis Anna 2019 Killers Anonymous Morgan 2020 The Intergalactic Adventures of Max Cloud Sarah
Television + Year Title Role Notes 2015 Guin and the Dragon Guin Television film 2015–2017 Hetty Feather Elizabeth Main role (series 1–3) 2018 Safe Carrie Delaney Main role 2018–2019 In the Long Run Kerry 4 episodes 2020 Find Me in Paris Romy Jensen Recurring role 2025 Wild Cherry Jocasta Main Cast
Awards and nominations AwardYearCategoryWorkResultCritics' Choice Movie Awards2012Best Acting EnsembleLes MisérablesNational Board of Review Award2012Best CastPhoenix Film Critics Society Award2012Best CastBest Youth Performance in a Lead or Supporting Role-FemaleSan Diego Film Critics Society2012Best Performance by an EnsembleSatellite Awards2012Best Cast – Motion PictureScreen Actors Guild Awards2012Outstanding Performance by a Cast in a Motion PictureWashington D.C. Area Film Critics Association2012Best EnsembleYoung Artist Award2013Best Performance in a Feature Film - Supporting Young Actress Ten and Under
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