Lia Williams (born 26 November 1964) is an English actress and director, on stage, in film and television. She has had television roles in The Crown (playing Wallis Simpson), in May 33rd (2004) for which she was nominated for a BAFTA, and in The Missing (2016), Kiri (2016), His Dark Materials (2019–2022) and The Capture (2019–2021).