Jalmari Helander (born 21 July 1976) is a Finnish screenwriter and film director. He is known for the 2010 film Rare Exports: A Christmas Tale, 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