Thomasin Harcourt McKenzie (born 26 July 2000) is a New Zealand actress. After a minor role in The Hobbit: The Battle of Five Armies (2014), she rose to critical prominence after playing a young girl living in isolation in Debra Granik's drama film Leave No Trace (2018), winning the National Board of Review Award for Breakthrough Performance. She continued gaining recognition with supporting roles in the 2019 films The King, Jojo Rabbit, and True History of the Kelly Gang. In 2021, she starred in M. Night Shyamalan's thriller Old and in Edgar Wright's psychological horror film Last Night in Soho.
Thomasin Harcourt McKenzie was born in Wellington, New Zealand, to actress Miranda Harcourt and director Stuart McKenzie. She is the granddaughter of actress Dame Kate Harcourt and Peter Harcourt. Peter's family founded the real estate company Harcourts International in Wellington. She has an elder brother and a younger sister, actress Davida McKenzie. She completed her secondary education at Samuel Marsden Collegiate School in 2018.

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