Justin Theroux
| Year | Movie | Function | Role |
| 2012 | Rock of Ages | writer | |
| 2011 | Wanderlust | actor | Seth |
| 2011 | Your Highness | actor | Leezar |
| 2010 | Iron Man 2 | writer | |
| 2009 | Call of Duty: Modern Warfare 2 | actor | Additional Voice Talent (voice) |
| 2009 | Parks and Recreation | actor | Justin Anderson (4 episodes, 2010) |
| 2008 | Tropic Thunder | writer | |
| 2008 | Tropic Thunder: Rain of Madness | writer | |
| 2008 | Tropic Thunder: Rain of Madness | actor | Jan Jürgen / host / narrator (uncredited) |
| 2007 | The Ten | actor | Jesus H. Christ |
| 2007 | Dedication | director | |
| 2007 | Broken English | actor | Nick Gable |
| 2006 | Return to Rajapur | actor | Jeremy Reardon |
| 2006 | Inland Empire | actor | Devon Berk / Billy Side |
| 2006 | Miami Vice | actor | Detective Larry Zito |
| 2006 | The Legend of Lucy Keyes | actor | Guy Cooley |
| 2005 | Strangers with Candy | actor | Carlo Honklin |
| 2005 | The Baxter | actor | Bradley Lake |
| 2003 | Duplex | actor | Coop |
| 2003 | Charlie's Angels: Full Throttle | actor | Seamus O'Grady |
| 2001 | Zoolander | actor | Evil DJ |
| 2001 | Muholland Dr | actor | Adam Kesher |
| 2000 | The Broken Hearts Club: A Romantic Comedy | actor | Marshall |
| 2000 | American Psycho | actor | Timothy Bryce |
| 1998 | Frogs for Snakes | actor | Flav Santana |
| 1997 | Below Utopia | actor | Daniel Beckett |
| 1997 | Romy and Michele's High School Reunion | actor | Cowboy |
| 1996 | I Shot Andy Warhol | actor | Mark |