Filmography
| Year | Title | Role | Notes |
|---|---|---|---|
| 1999 | King and Me, TheThe King and Me | Pizza boy | |
| Flushed | Pathetic guy | ||
| 2001 | Heartbreakers | Bill | |
| Bubble Boy | Bus stop man | ||
| Corky Romano | Dexter | ||
| Out Cold | Luke | ||
| 2002 | Late World with Zach | Host | Television series: 29 episodes |
| Below | Weird Wally | ||
| 2003–05 | Tru Calling | Davis | Television series: 27 episodes |
| 2004 | Zach & Avery of Fergus | Homeless man | |
| 2005 | The Comedians of Comedy | Himself | |
| 2006 | Pity Card, TheThe Pity Card | Zach | |
| Dog Bites Man | Alan Finger | Television series: 9 episodes | |
| 2007-10 | Tim and Eric Awesome Show, Great Job! | Tairy Greene | Television series: 6 episodes |
| 2007 | Zach Galifianakis Live at the Purple Onion | Himself/Seth Galifinakis | Also writer/executive producer |
| Into the Wild | Kevin | ||
| 2008 | What Happens in Vegas | Dave the Bear | |
| Super High Me | Himself | Documentary | |
| Visioneers | George | ||
| 2009 | The Ballad of G.I. Joe | Snow Job | Video short |
| Gigantic | Homeless guy | ||
| Hangover, TheThe Hangover | Alan Garner |
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| 2009-10 | American Dad! | Heavyset Man and Norman; Juror | Television series: 2 episodes (voice only) |
| 2009 | G-Force | Ben | |
| 2009–11 | Bored to Death | Ray | Television series: 16 episodes |
| 2009 | Up in the Air | Steve | |
| Operation: Endgame | Hermit | Straight to DVD | |
| Little Fish, Strange Pond aka. (Frenemy) | Bucky | ||
| 2010 | Youth in Revolt | Jerry | |
| Frenemy | Adult Shop Clerk | ||
| Tim and Eric Awesome Show, Great Job! Chrimbus Special | Tairy Greene | Television movie | |
| Dinner for Schmucks | Therman Murch | Comedy Award – Best Comedy Actor in Film | |
| It's Kind of a Funny Story | Bobby | ||
| Due Date | Ethan Tremblay/Ethan Chase | Nominated – MTV Movie Award for Best Comedic Performance Nominated – Teen Choice Awards for Choice Movie: Actor Comedy (also for The Hangover Part II) |
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| 2010–11 | Saturday Night Live | Himself | Television show: 2 episodes Nominated – Primetime Emmy Award for Outstanding Guest Actor in a Comedy Series (2011) |
| 2011 | Hangover Part II, TheThe Hangover Part II | Alan Garner | Nominated – MTV Movie Award for Best Comedic Performance Nominated – Teen Choice Awards for Choice Movie: Actor Comedy (also for Due Date) Nominated – Teen Choice Awards for Choice Movie: Chemistry |
| Puss in Boots | Humpty Dumpty | Voice only Nominated – Annie Award for Best Voice from an Animated Feature |
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| The Muppets | Hobo Joe | Cameo appearance | |
| 2012 | Tim and Eric's Billion Dollar Movie | Jim Joe Kelly | |
| The Campaign | Marty Huggins | ||
| 2013 | The Hangover Part III | Alan Garner | |
| You Are Here | TBA |
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