by Contents
Movies
| Year | Movie | Role |
| 2005 | Good Night, and Good Luck | Joseph Wershba |
| 2005 | Hubert Selby Jr | Narrator |
| 2006 | A Guide to Recognizing Your Saints | Dito Montiel |
| 2006 | The Shaggy Dog | Dr. Kozak |
| 2006 | A Scanner Darkly | James Barris |
| 2006 | Fur | Lionel Sweeney |
| 2007 | Zodiac | Paul Avery |
| 2007 | Lucky You | Telephone Jack |
| 2007 | Charlie Bartlett | Principal Nathan Gardner |
| 2008 | Iron Man | Tony Stark / Iron Man |
| 2008 | The Incredible Hulk | Tony Stark / Iron Man |
| 2008 | Tropic Thunder | Kirk Lazarus |
| 2009 | The Soloist | Steve Lopez |
| 2009 | Sherlock Holmes | Sherlock Holmes |
| 2010 | Iron Man 2 | Tony Stark / Iron Man |
| 2010 | Love & Distrust | Rob |
| 2010 | Due Date | Peter Highman |
| 2011 | Sherlock Holmes: A Game of Shadows | Sherlock Holmes |
| 2012 | The Avengers | Tony Stark / Iron Man |
| 2013 | Iron Man 3 | Tony Stark / Iron Man |
| 2014 | The Judge | Hank Palmer |
| 2014 | Chef | Marvin |
| 2015 | Avengers: Age of Ultron | Tony Stark / Iron Man |
| 2016 | Captain America: Civil War | Tony Stark / Iron Man |
| 2017 | Spider-Man: Homecoming | Tony Stark / Iron Man |
| 2018 | Avengers: Infinity War | Tony Stark / Iron Man |
| 2019 | Avengers: Endgame | Tony Stark / Iron Man |
| 2020 | Dolittle | Dr. John Dolittle |
| 2021 | Black Widow | Tony Stark / Iron Man |
| 2021 | All-Star Weekend | TBA |
TV Show
| Year | TV Show | Role |
| 1985 | Mussolini: The Untold Story | Bruno Mussolini |
| 1985–1986 | Saturday Night Live | Various characters |
| 1995 | Mr. Willowby’s Christmas Tree | Mr. Willowby |
| 2000–2002 | Ally McBeal | Larry Paul |
| 2005 | Family Guy | Patrick Pewterschmidt (voice) |
| 2019 | The Age of A.I. | Himself (host) |
| 2021 | What If…? | Tony Stark / Iron Man (voice) |
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