Her first movie role was in the German film Olga's Summer (2002)
But she is best known for the role of Fleur Delacour in Harry Potter and the Goblet of Fire (2005), Harry Potter and the Deathly Hallows: Part 1 (2010) and Harry Potter and the Deathly Hallows: Part 2 (2011).
On US TV, she is also known for the role of Eva Coupeau on Gossip Girl (2007).
Clémence Poésy can currently be seen as Isabelle on the AMC series The Walking Dead: Daryl Dixon.