Katharine O'Donnelly

Katharine O'Donnelly is a Scottish actress. She is known for her starring role as Maggie Mitchell in the HBO series The Head (2020–2025).

Early life O'Donnelly is from the Isle of Arran. She discovered acting through a primary school play. She attended Arran High School and took weekend acting classes. She did not initially get into the Royal Conservatoire of Scotland (RCS), and did a year-long performance course at Glasgow Clyde College in the meantime. She successfully reapplied to the RCS, going on to graduate with a Bachelor of Arts in Acting.

Career In 2018, O'Donnelly made her television debut and her feature film debut with small roles in the BBC Three thriller Clique and Josie Rourke's Mary Queen of Scots (2018) respectively. She played the titular character of Rapunzel at the Cumbernauld Theatre in Glasgow.

O'Donnelly broke out when she starred as Dr Maggie Mitchell alongside John Lynch and Alexandre Willaume in the 2020 Spanish-produced thriller series The Head, which was released internationally on platforms such as HBO Max, HBO Asia, and Starzplay. O'Donnelly reprised her role in the second season, which aired in 2022.

Filmography Year Title Role Notes 2018 Clique Gemma 1 episode 2018 Mary Queen of Scots Holyrood Servant 2019 The Deep Sleep Chloe 2020–2025 The Head Maggie Mitchell Main role 2023 The Phoebus Files Sarah Episode: "Girl at the River" 2025 Outlander: Blood of My Blood Maisri Episode: "Needfire"