Sophia Di Martino (born 15 November 1983) is an English actress known for portraying Sylvie in the Marvel Cinematic Universe television series Loki, 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 Flowers (2016–2018) and Casualty (2009–2011).

Di Martino was born in Nottingham and grew up in the suburb of Attenborough. She is half Italian. She attended Chilwell Comprehensive School, where she completed an A-level in performing arts. She went on to graduate with a Bachelor of Arts with honours in media and performance from the University of Salford.

Di Martino works in television, film, theatre, and music. In Channel 4's Flowers, she plays Amy Flowers. She plays Eva in the 2016 feature film The Darkest Universe. She appeared as Amber in the third series of Sky's Mount Pleasant and as Emma, the girlfriend of Simon Bird's character Adam, in the first episode of series three of Channel 4's Friday Night Dinner. She also appeared in the third series of 4 O'Clock Club in 2014 as Miss Parkwood and in the 2015 film Royal Day Out.

She was a regular cast member of Casualty, playing the role of Pauline "Polly" Emmerson from 19 March 2009 until 30 April 2011. In 2018, she appeared in Click & Collect.

In 2019, she was cast as Sylvie in the Disney+ show Loki. Season one premiered on 9 June 2021 and concluded on 14 July. Di Martino won Best Breakthrough Performance and Best Team with Tom Hiddleston and Owen Wilson at the 2022 MTV Movie & TV Awards. Season two of Loki premiered on 5 October 2023.

Di Martino also co-hosts the True Spies podcast.

In 2016, Di Martino stated that she has "had relationships with both men and women," that she believes "sexuality is a fluid thing," and that she has "definitely tried on different labels at different points in my life." She is married to actor and writer Will Sharp, with whom she has been in a relationship since 2009. They have two children, born in 2019 and 2021.

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