Sarah Phelps is a British television, radio, film and freelance playwright and producer. She is best known for her work on EastEnders, a number of BBC serial adaptations including Agatha Christie's The Witness For the Prosecution, And Then There Were None, Dickens’ Great Expectations and Oliver Twist, JK Rowling’s The Casual Vacancy and work with the Royal Shakespeare Company. Phelps also wrote for the World Service Soap opera Westway before joining the BBC in 2002.
Phelps has written over 50 episodes of EastEnders, including the return of Den Watts and his final demise, less than two years later, when he was killed by his wife, Chrissie. A journalist for the British tabloid The Daily Mirror described her as "Enders' best writer". She has written over 40 episodes of Westway, which won Best Soap Award at the Commission for Racial Equality's Race in the Media Awards (RIMA).
Phelps wrote the screenplay for the BBC's 2011 Christmas costume drama adaptation Great Expectations and the drama series The Crimson Field. In 2015, a television adaptation of J.K. Rowling's The Casual Vacancy was written by Phelps. In the same year, her adaptation of Agatha Christie's And Then There Were None was broadcast. Reviewing the latter for The Daily Telegraph, Tim Martin found that, "The final episode of this bloody adaptation by Sarah Phelps did splendid justice to Christie's lightless universe, presenting an isolated mansion full of leaking corpses, in which the characters – quite understandably – freaked out in ways that no previous adaptation has countenanced".