Actor
- The Avengers (2011) .... Tony Stark / Iron Man
- Master Mind (2010) .... (voice) (rumored)
- Due Date (2010) ....
- Iron Man 2 (2010) .... Tony Stark / Iron Man
- Sherlock Holmes (2009) .... Sherlock Holmes
- Spike's Guys Choice (2009) .... Himself - Presenter
- The Soloist (2009) .... Steve Lopez
- Star Movies: Live from the Red Carpet (2009) .... Himself
- 81st Annual Academy Awards (2009) .... Himself - Nominee - Best Supporting Actor
- The 66th Annual Golden Globe Awards (2009) .... Himself
- Spike Guys Choice (2008) .... Himself
- The Incredible Hulk (2008) .... Tony Stark (uncredited)
- 2008 MTV Movie Awards (2008) .... Himself
- Iron Man (2008) .... Tony Stark
- Charlie Bartlett (2008) .... Principal Nathan Gardner
- Tropic Thunder (2008) .... Kirk Lazarus - Hot LZ
- The Modern Warrior (2007) .... Himself
- Out of Control: 10 Celebrity Rehabs Exposed (2007) .... Himself
- Lucky You (2007) .... Telephone Jack
- Zodiac (2007) .... Paul Avery
- Old Hollywood: Silent Stars, Deadly Secrets (2007) .... (uncredited) (archive footage)
- Fur: An Imaginary Portrait of Diane Arbus (2006) .... Lionel Sweeney
- A Guide to Recognizing Your Saints (2006) .... Dito
- A Scanner Darkly (2006) .... James Barris
- Payback (2006) .... Himself (1 episode, 2007)
- The Shaggy Dog (2006) .... Dr. Kozak
- HBO First Look Fur: An Imaginary Portrait of Diane Arbus (2006) .... Himself
- American Masters Annie Leibovitz: Life Through a Lens (2006) .... Himself
- Saturday Night Live in the '80s: Lost & Found (2005) .... Various (archive footage)
- Good Night, and Good Luck. (2005) .... Joe Wershba
- Kiss Kiss Bang Bang (2005) .... Harry Lockhart
- Tsunami Aid: A Concert of Hope (2005) .... Himself
- Game 6 (2005) .... Steven Schwimmer
- The Outsider (2005) .... Himself
- Hubert Selby Jr: It/ll Be Better Tomorrow (2005) .... Narrator
- Family Guy Fat Guy Strangler (2005) .... Patrick Pewterschmidt (voice)
- The Kennedy Center Honors: A Celebration of the Performing Arts (2004) .... Himself
- St. Richard of Austin (2004) .... Himself
- Eros (2004) .... Nick Penrose (segment "Equilibrium")
- Between the Lines (2004) .... Host
- Tangled Up in Blue (2004) .... Himself
- Gothika (2003) .... Pete Graham
- The Singing Detective (2003) .... Dan Dark
- Sunday Morning Shootout (2003) .... Himself (5 episodes, 2004-2006)
- Hollywood Celebrates Denzel Washington: An American Cinematheque Tribute (2003) .... Himself
- Last Party 2000 (2003) .... Himself
- Charlie: The Life and Art of Charles Chaplin (2003) .... Himself
- Whatever We Do (2003) .... Bobby
- 101 Most Shocking Moments in Entertainment (2003) .... Himself (archive footage)
- Lethargy (2002) .... Animal Therapist
- Black and White (2000) .... Terry Donager
- Wonder Boys (2000) .... Terry Crabtree
- Auto Motives (2000) .... Rob
- Bowfinger (1999) .... Jerry Renfro
- Friends & Lovers (1999) .... Hans
- In Dreams (1999) .... Vivian Thompson
- Two Girls and a Guy (1998) .... Blake Allen
- U.S. Marshals (1998) .... Special Agent John Royce
- The Gingerbread Man (1998) .... Clyde Pell
- Hugo Pool (1997) .... Franz Mazur
- One Night Stand (1997) .... Charlie
- Danger Zone (1997) .... Jim Scott
- Restoration (1996) .... Robert Merivel
- Richard III (1995) .... Lord Rivers
- Mr. Willowby's Christmas Tree (1995) .... Mr. Willowby
- Home for the Holidays (1995) .... Tommy Larson
- Only You (1994) .... Peter Wright, alias Damon Bradley
- Natural Born Killers (1994) .... Wayne Gale
- Hail Caesar (1994) .... Jerry
- A Century of Cinema (1994) .... Himself
- Short Cuts (1993) .... Bill Bush
- Heart and Souls (1993) .... Thomas Reilly
- Chaplin (1993) .... Charles Spencer Chaplin
- The Last Party (1993) .... Himself
- Luck, Trust & Ketchup: Robert Altman in Carver Country (1993) .... Himself
- Soapdish (1991) .... David Seton Barnes
- Too Much Sun (1991) .... Reed Richmond
- Air America (1990) .... Billy Covington
- Chances Are (1989) .... Alex Finch
- True Believer (1989) .... Roger Baron
- That's Adequate (1989) .... Albert Einstein
- 1969 (1988) .... Ralph Carr
- Rented Lips (1988) .... Wolf Dangler
- Johnny Be Good (1988) .... Leo Wiggins
- Get Out the Vote (1988) .... Himself
- Less Than Zero (1987) .... Julian Wells
- The Pick-up Artist (1987) .... Jack Jericho (as Robert Downey)
- Dear America: Letters Home from Vietnam (1987) .... (voice)
- Back to School (1986) .... Derek
- "Saturday Night Live" Jay Leno/The Neville Brothers (1986) .... Various (as Robert Downey)
- America (1986) .... Paulie Hackley
- Saturday Night Live Anjelica Huston and Billy Martin/George Clinton & Parliament-Funkadelic (1986) .... Various (as Robert Downey)
- Mussolini: The Untold Story (1985) .... Bruno Mussolini (as Robert Downey)
- Weird Science (1985) .... Ian (as Robert Downey)
- Tuff Turf (1985) .... Jimmy Parker (as Robert Downey)
- Deadwait (1985) ....
- Firstborn (1984) .... Lee
- Baby It's You (1983) .... Stewart
- Up the Academy (1980) .... (uncredited)
- Moment to Moment (1975) .... Himself (uncredited)
- Greaser's Palace (1972) .... (uncredited)
- Pound (1970) .... Puppy (as Bob Downey)
- A Guide to Recognizing Your Saints (2006) .... co-producer
- Two Girls and a Guy (1998) .... composer: song "Snake"
- The Last Party (1993) ....


gokul
zhihui