Born in 1985, T'Nia Miller's early career consisted of small roles on British TV and film. In 2015, she appeared in an episode of the BBC TV show Dr. Who, and she appeared opposite Emma Thompson in the TV drama Years and Years in 2019 .
Miller has appeared in multiple Netflix series, including Free Rein (2017), The Haunting of Bly Manor (2020) and The Fall of the House of Usher (2023).