Sophia Di Martino (born 15 November 1983) is an English actress known for portraying Sylvie in the Marvel Cinematic Universe television series Loki (2021–2023), which earned her two MTV Movie & TV Awards and a nomination for a Critics' Choice Television Award for Best Supporting Actress in a Drama Series. She has also had starring roles in the television shows Casualty (2009–2011) and Flowers (2016–2018).