Ruby Allen is a fictional character from the BBC soap opera EastEnders, played by Louisa Lytton from 18 March 2005 to 23 November 2006, and then again from 18 September 2018 to 17 September 2021, with the recent being on 18 November 2024 until 10 April 2025. The character and casting were announced in February 2005, and Ruby was introduced in March that year by producer Kathleen Hutchison. She was featured in storylines surrounding her gangland father Johnny Allen (Billy Murray), with whom she shared a problematic relationship due to his criminal lifestyle. Other storylines included a close friendship with Stacey Slater (Lacey Turner), and an engagement to Stacey's brother Sean (Robert Kazinsky) – which affected their friendship. In July 2006, Lytton was axed from the show due to limited possibilities for the character following the death of her on-screen father, and Ruby departed on 23 November 2006. Lytton expressed a disappointment in her exit but stated that she would always be grateful for the role.
In July 2018, it was announced that producer John Yorke had decided to reintroduce the character. Following a twelve-year hiatus, Ruby returned on 18 September 2018 to reunite with her best friend Stacey. Producers soon placed her at the centre of a sexual consent storyline, involving a special episode about the views surrounding consent. Lytton and the storyline were praised by viewers and critics alike. In March 2021, Lytton announced she was expecting her first child and would go on maternity leave later in the year. Ruby departed in the episode broadcast on 17 September 2021. In March 2022, Lytton admitted she may not return to the soap following her maternity leave. However in September 2024, it was announced that Lytton would be reprising the role for a prolonged stint later in the year ahead of the show's 40th anniversary. Ruby returned in episode 7015, broadcast 18 November 2024. On 31 March 2025, Lytton confirmed that she had finished filming her stint, and would exit in the coming weeks. Ruby departed the show on 10 April.