Jalmari Helander (born 21 July 1976) is a Finnish screenwriter and film director. He is known for the 2010 film ', the 2014 action-adventure Big Game starring Samuel L. Jackson, and the 2022 WWII action film Sisu. Before turning to feature films, Helander directed several short films and award-winning television commercials. In 2025, it was announced that Helander would direct John Rambo, the upcoming prequel to First Blood (1982) in the Rambo franchise.
Helander is the brother-in-law of actor Jorma Tommila and the maternal uncle of Jorma's son Onni, both of whom have acted in his films.
Helander has stated that he has panic disorder
Short film
Feature film
TV series