Peter Claffey (born 28 July 1996) is an Irish actor and former rugby union player known for portraying the titular hedge knight Ser Duncan "Dunk" the Tall in the HBO series A Knight of the Seven Kingdoms (2026).
Claffey is from Portumna, in County Galway. He attended Garbally College and played rugby union for Galwegians RFC. He later studied acting at the Bow Street Academy in Dublin, where he graduated in 2020.
Claffey played rugby union for Ballinasloe RFC and then University of Galway, subsequently joining Galwegians. A lock forward, he joined the Connacht Rugby academy in 2015. He played for Ireland U20 in the 2016 Six Nations Under 20s Championship. He signed a professional contract with Connacht Rugby in 2018. In 2019, he signed for Terenure College.
Claffey made his professional stage debut in 2022 playing Iggy in Tom Murphy's A Whistle in the Dark at the Abbey Theatre in Dublin. His onscreen career began in 2022 with television appearances on the shows Harry Wild and Apple TV dark comedy Bad Sisters. That year, he played Cormac in the BBC Three comedy series Wreck, for which he filmed a second series in 2023. Claffey then appeared in the third series of Vikings: Valhalla and the film adaptation of Small Things Like These. He also appeared in the second series of Bad Sisters playing the character Joe Walsh.
In April 2024, Claffey was cast in the Game of Thrones prequel series in the titular role of Ser Duncan the Tall, also known as Dunk, in A Knight of the Seven Kingdoms, written by George R. R. Martin and Ira Parker. The series premiered in 2026.
