Thomasin Harcourt McKenzie (born 26 July 2000) is an actress from New Zealand. After a minor role in The Hobbit: The Battle of Five Armies, she rose to critical prominece with the lead role in Debra Granik's 2018 drama film Leave No Trace. After supporting roles in the 2019 films The King, Jojo Rabbit and True History of the Kelly Gang, as well as the 2021 thriller Old, Edgar Wright's psychological horror film Last Night in Soho established her as one of the industry's lead actresses.

Filmography

• 2026The Uprising — Alyce
• 2026Victorian Psycho — Miss Lamb
• 2025Fackham Hall — Rose
• 2025Our Party
• 2025The Testament of Ann Lee — Mary Partington / Narrator
• 2024JOY — Jean Purdy
• 2023Eileen — Eileen Dunlop
• 2023How Can I Help You
• Totally Completely Fine — Vivian Cunningham
• Life After Life — Ursula
• Pantheon — MIST (voice)
• 2021Last Night in Soho — Eloise Turner
• 2021Old — Maddox Aged 16
• 2021The Justice of Bunny King — Tonyah
• 2021The Power of the Dog — Lola
• 2020Lost Girls — Sherre Gilbert
• 2019Jojo Rabbit — Elsa
• 2019The King — Philippa, Queen of Denmark
• 2019True History of the Kelly Gang — Mary Hearn
• 2018Leave No Trace — Tom
• 2017The Changeover — Rose Keaton
• 2016Jean — Young Jean
• Lucy Lewis Can't Lose — Lucy Lewis
• 2015The Boyfriend Game — Edith
• 2014Consent: The Louise Nicholas Story — Young Louise
• 2014The Hobbit: The Battle of the Five Armies — Astrid
• 2012Existence — Scraps
• Dinner with Audrey — Audrey Hepburn
• Grendel — Queen Wealhtheow
• Rule of Three — Lizzy
• Sister Maria Goes to Rome — Sister Maria
• The Tale of Robin Hood

Appearances as themselves (3)

• 2022Behind the Scenes with Jane Campion — Self (archive footage)
• Anika Moa Unleashed — Self
• The Late Show with Stephen Colbert — Self