Catrin Stewart (born 29 January 1988) is a Welsh actress best known for playing Jenny Flint in the BBC science fiction series Doctor Who (2011–2014), Emma Morris in the Sky One comedy drama Stella (2012–2017) and PC Gina Jenkins in the S4C crime drama Bang (2017–2020). She also portrayed Lily in Misfits (2010–2011).
Stewart grew up in Wales and attended the Welsh-language secondary school Ysgol Gyfun Gymraeg Plasmawr in Cardiff. From a young age, she performed at the annual eisteddfod, a competitive festival of the arts between schools. Her mother used to tell her that she was "the one in the school concert she could hear out of everyone" as she was so passionate about acting. She went to drama classes from the age of 10 to 15, where she was mainly trained for television. At the age of 16, she joined the National Youth Theatre of Wales and went on to study at the Royal Welsh College of Music & Drama. Before graduating, Stewart had already appeared in the BBC One medical drama Casualty (2007), as well as the films Hearts of Gold (2003) and Crusade in Jeans (2006).
In 2011, she joined the main cast of the Sky One comedy series Stella (2012–2017), portraying Emma Morris, the "sweet, loving and funny" daughter of Ruth Jones' titular character.

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