Jason Reitman (born October 19, 1977) is a Canadian-American actor and filmmaker, best known for directing the films Thank You for Smoking (2005), Juno (2007), Up in the Air (2009), Young Adult (2011), and Ghostbusters: Afterlife (2021). He has received one Grammy Award, one Golden Globe, and four Academy Award nominations.

He is the son of late filmmaker Ivan Reitman.