| År | Film | Rolle | Noter |
|---|
| 1970 | Pound | en hvalp | Instrueret afRobert Downey Sr. |
| 1972 | Greaser's Palace | ikke krediteret | Instrueret afRobert Downey Sr. |
| 1975 | Moment to Moment | ikke krediteret | Instrueret afRobert Downey Sr. |
| 1980 | Up the Academy | Caleb Yoon | Instrueret afRobert Downey Sr. |
| 1983 | Baby It's You | Stewart | |
| 1984 | Firstborn | Lee | |
| 1985 | Deadwait | | kortfilm |
| Tuff Turf | Jimmy Parker | |
| Weird Science | Ian | |
| 1986 | Back to School | Derek | |
| America | Paulie Hackley | |
| 1987 | The Pick-up Artist | Jack Jericho | |
| Less Than Zero | Julian Wells | |
| 1988 | Johnny Be Good | Leo Wiggins | |
| Rented Lips | Wolf Dangler | |
| 1969 | Ralp Carr | |
| 1989 | That's Adequate | Albert Einstein | |
| True Believer | Roger Baron | |
| Chances Are | Alex Finch | |
| 1990 | Air America | Billy Covington | |
| 1991 | Too Much Sun | Reed Richmond | |
| Soapdish | David Seton Barnes | |
| 1992 | Chaplin | Charlie Chaplin | |
| 1993 | Luck, Trust & Ketchup: Robert Altman in Carver Country | | dokumentar |
| Heart and Souls | Thomas Reilly | |
| The Last Party | Sig selv | dokumentar skrevet af Downey |
| Short Cuts | Bill Bush | |
| 1994 | Hail Caesar | Jerry | |
| A Century of Cinema | | dokumentar |
| Natural Born Killers | Wayne Gale | Instrueret afOliver Stone |
| Only You | Peter Wright, alias Damon | |
| 1995 | Richard III | Lord Rivers | |
| Home for the Holidays | Tommy Larson | |
| Restoration | Robert Merivel | |
| Mr. Willowby's Christmas Tree | Mr. Willowby | Tv-film |
| 1997 | Danger Zone | Jim Scott | |
| One Night Stand | Charlie | |
| Two Girls and a Guy | Blake Allen | |
| Hugo Pool | Franz Mazur | |
| 1998 | The Gingerbread Man | Clyde Pell | |
| U.S. Marshals | Special Agent John Royce | |
| 1999 | In Dreams | Vivian Thompson | |
| Friends & Lovers | Hans | |
| Bowfinger | Jerry Renfro | |
| Black and White | Terry Donager | |
| 2000 | Wonder Boys | Terry Crabtree | |
| Auto Motives | Rob | kortfilm |
| 2001 | Last Party 2000 | | dokumentar |
| 2002 | Lethargy | Animal therapist | kortfilm |
| 2003 | Whatever We Do | Bobby | kortfilm |
| The Singing Detective | Dan Dark | |
| Charlie: The Life and Art of Charles Chaplin | | dokumentar |
| Gothika | Pete Graham | |
| 2004 | Eros (segment "Equilibrium") | Nick Penrose | |
| 2005 | Game 6 | Steven Schwimmer |
| The Outsider | Sig selv | dokumentar |
| Kiss Kiss Bang Bang | Harry Lockhart | |
| Good Night, and Good Luck | Joe Wershba | |
| Hubert Selby Jr: It/ll Be Better Tomorrow | Fortæller | dokumentar |
| 2006 | The Shaggy Dog | Dr. Kozak | |
| A Scanner Darkly | James Barris | |
| A Guide to Recognizing Your Saints | Dito Montiel | |
| Fur: An Imaginary Portrait of Diane Arbus | Lionel Sweeney | |
| 2007 | Zodiac | Paul Avery | |
| Lucky You | Telephone Jack | |
| 2008 | Charlie Bartlett | Principal Gardner | |
| Iron Man | Tony Stark/Iron Man | |
| The Incredible Hulk | Tony Stark | cameo |
| Tropic Thunder | Kirk Lazarus | |
| Solisten | Steve Lopez | |
| 2009 | Sherlock Holmes | Sherlock Holmes | |
| 2010 | Iron Man 2 | Tony Stark/Iron Man | |
| Due Date | Peter Highman | |
| 2011 | Sherlock Holmes 2: Skyggespillet | Sherlock Holmes | |
| 2012 | The Avengers | Tony Stark/Iron Man | |
| 2013 | Iron Man 3 | Tony Stark/Iron Man | |
| 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 | Doctor Dolittle | |
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