Robert John Downey Jr. (Nova York, 4 de abril de 1965). É filho do produtor de filmes independentes Robert Downey. Como vivenciou desde criança o meio artístico do cinema, isto posteriormente o ajudou na carreira de ator. Com apenas 5 anos de idade apareceu no filme Pound e aos 7 anos em Greaser's Palace, ambos produzidos por seu pai.
Filmografia :
The Avengers (2011) (announced) .... Tony Stark / Iron Man
Iron Man 2 (2010) (pre-production) .... Tony Stark / Iron Man
Master Mind (2010) (filming) (voice)
Sherlock Holmes (2009) (post-production) .... Sherlock Holmes
The Soloist (2009) .... Steve Lopez
Tropic Thunder: Rain of Madness (2008) (V) .... Kirk Lazarus
Tropic Thunder (2008) .... Kirk Lazarus
The Incredible Hulk (2008) (uncredited) .... Tony Stark
Iron Man (2008) (VG) (voice) .... Tony Stark
Iron Man (2008) .... Tony Stark
Charlie Bartlett (2007) .... Principal Nathan Gardner
Lucky You (2007) .... Telephone Jack
Zodiac (2007/I) .... Paul Avery
Fur: An Imaginary Portrait of Diane Arbus (2006) .... Lionel Sweeney
A Scanner Darkly (2006) .... James Barris
The Shaggy Dog (2006) .... Dr. Kozak
A Guide to Recognizing Your Saints (2006) .... Dito
"Family Guy" .... Patrick Pewterschmidt (1 episode, 2005)
Good Night, and Good Luck. (2005) .... Joe Wershba
Kiss Kiss Bang Bang (2005) .... Harry Lockhart
Game 6 (2005) .... Steven Schwimmer
Eros (2004) .... Nick Penrose (segment "Equilibrium")
Gothika (2003) .... Pete Graham
The Singing Detective (2003) .... Dan Dark
Whatever We Do (2003) .... Bobby
"Ally McBeal" .... Larry Paul (22 episodes, 2000-2002)
Lethargy (2002) .... Animal Therapist
Auto Motives (2000) .... Rob
Wonder Boys (2000) .... Terry Crabtree
Black and White (1999/I) .... Terry Donager
Bowfinger (1999) .... Jerry Renfro
Friends & Lovers (1999) .... Hans
In Dreams (1999) .... Vivian Thompson
U.S. Marshals (1998) .... Special Agent John Royce
The Gingerbread Man (1998) .... Clyde Pell
Hugo Pool (1997) .... Franz Mazur
Two Girls and a Guy (1997) .... Blake Allen
One Night Stand (1997) .... Charlie
Danger Zone (1996) .... Jim Scott
Restoration (1995) .... Robert Merivel
Mr. Willowby's Christmas Tree (1995) (TV) .... Mr. Willowby
Home for the Holidays (1995) .... Tommy Larson
Richard III (1995) .... Lord Rivers
Only You (1994) .... Peter
Natural Born Killers (1994) .... Wayne Gale
Hail Caesar (1994) .... Jerry
Short Cuts (1993) .... Bill Bush
Heart and Souls (1993) .... Thomas Reilly
Chaplin (1992) .... Charles Spencer Chaplin
Soapdish (1991) .... David Seton Barnes
Too Much Sun (1990) .... 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
Less Than Zero (1987) .... Julian Wells
The Pick-up Artist (1987) (as Robert Downey) .... Jack Jericho
America (1986) .... Paulie Hackley
Back to School (1986) .... Derek
"Saturday Night" .... Various / ... (18 episodes, 1985-1986)
"Mussolini: The Untold Story" (1985) TV mini-series (as Robert Downey) .... Bruno Mussolini
Weird Science (1985) (as Robert Downey) .... Ian
Tuff Turf (1985) (as Robert Downey) .... Jimmy Parker
Deadwait (1985)
Firstborn (1984) .... Lee
Baby It's You (1983) .... Stewart
Up the Academy (1980) (uncredited)
Greaser's Palace (1972) (uncredited)
Pound (1970) (as Bob Downey) .... Puppy