Emily Mortimer is a British-American actress who has contributed to the world of anime voice acting primarily through her work on English-language dubs of Japanese films. She was born on December 1, 1971, in London, United Kingdom, and studied at the University of Oxford before beginning her acting career.

Mortimer is best known in the anime genre for her role as the voice of young Sophie Hatter in the English dub of the 2004 Studio Ghibli film Howl's Moving Castle, directed by Hayao Miyazaki. In this film, the character Sophie is transformed from a young woman into an elderly lady by a witch's curse. Mortimer provides the voice for Sophie in her younger form, while the role of the older Sophie is performed by actress Jean Simmons. The English-language production of Howl's Moving Castle featured a notable cast, with Christian Bale voicing the title character Howl and Billy Crystal voicing the fire demon Calcifer.

Beyond her work in anime, Mortimer's broader voice acting career includes the role of Holley Shiftwell in the 2011 Disney·Pixar film Cars 2. Her extensive work in live-action film and television includes roles in The Newsroom, Mary Poppins Returns, Shutter Island, and Match Point. She received an Independent Spirit Award for her performance in the film Lovely and Amazing. Her role as Sophie Hatter remains her most significant and recognized contribution to the anime medium.