Thomasin Harcourt McKenzie is a New Zealand actress. A daughter of actress Miranda Harcourt, she began working as a teenager. After a minor role in The Hobbit: The Battle of the Five Armies (2014), she rose to critical prominence for 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, as well as her role as Elsa Korr in the Academy Award-winning satirical comedy film Jojo Rabbit (2019).