Thaddea Graham (born 17 September 1997) is a Northern Irish actress. She is known for her roles in the Sky One series Curfew (2019), the Netflix series The Letter for the King (2020), The Irregulars (2021) and Sex Education (2023), and the BBC series Us (2020), Doctor Who: Flux (2021) and Wreck (2022).

Graham appeared on the 2023 Screen International Rising Stars Ireland list.

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