Joachim Trier is a Norwegian writer and director. He is known for Reprise (2006), Oslo, August 31st (2011), Louder Than Bombs (2015) and Thelma (2017).
Trier also directed three short films, Pietà (2000), Still (2001) and Procter (2002).
His father, Jacob Trier, was the sound technician of The Pinchcliffe Grand Prix, a notable film produced in Norway in 1975.
Louder Than Bombs was his first English-language film.
Thelma was selected as the Norwegian entry for the Best Foreign Language Film at the 90th Academy Awards.