Here is a bit of information about the main actors in The Departed. For more, click the link to go to their IMDb pages! For the full cast list, see IMDb.
Leonardo DiCaprio (Billy Costigan) [ IMDb page ]
Birth: November 11, 1974 in Hollywood, California
Selected Filmography: This Boy's Life (1993); What's Eating Gilbert Grape (1993); The Quick and The Dead (1995); The Basketball Diaries (1995); Total Eclipse (1995); Romeo + Juliet (1996); Marvin's Room (1996); Titanic (1997); The Man in the Iron Mask (1998); The Beach (2000); Gangs of New York (2002); Catch Me If You Can (2002); The Aviator (2004); Blood Diamond (2006)
Matt Damon (Colin Sullivan) [ IMDb page ]
Birth: October 8, 1970 in Cambridge, Massachusetts
Selected Filmography: School Ties (1992); Geronimo: An American Legend (1993); Courage Under Fire (1996); The Rainmaker (1997); Good Will Hunting (1997); Saving Private Ryan (1998); Rounders (1998); Dogma (1999); The Talented Mr. Ripley (1999); The Legend of Bagger Vance (2000); All the Pretty Horses (2000); Ocean's 11 (2001); Gerry (2002); The Bourne Identity (2002); Stuck on You (2003); The Bourne Supremacy (2004); Ocean's 12 (2004); The Brothers Grimm (2005); Syriana (2005); The Good Shepherd (2006)
Jack Nicholson (Frank Costello) [ IMDb page ]
Birth: April 22, 1937 in New York, New York
Selected Filmography: The Cry Baby Killer (1958); Little Shop of Horrors (1960); The Wild Ride (1960); The Terror (1963); Back Door to Hell (1964); Ride in the Whirlwind (1965); The Shooting (1967); Hell's Angels on Wheels (1967); Psych-Out (1968); Easy Rider (1969); Five Easy Pieces (1970); Carnal Knowledge (1971); The King of Marvin Gardens (1972); The Last Detail (1973); Chinatown (1974); The Passenger (1975); The Fortune (1975); One Flew Over the Cuckoo's Nest (1975); The Missouri Breaks (1976); Goin' South (1978); The Shining (1980); The Postman Always Rings Twice (1981); Reds (1981); The Border (1982); Terms of Endearment (1983); Prizzi's Honor (1985); Heartburn (1986); The Witches of Eastwick (1987); Ironweed (1987); Batman (1989); The Two Jakes (1990); Man Trouble (1992); A Few Good Men (1992); Hoffa (1992); Wolf (1994); The Crossing Guard (1995); Blood and Wine (1996); The Evening Star (1996); Mars Attacks! (1996); As Good As It Gets (1997); The Pledge (2001); About Schmidt (2002); Anger Management (2003); Something's Gotta Give (2003)
Mark Wahlberg (Dignam) [ IMDb page ]
Birth: June 5, 1971 in Dorchester, Massachusetts
Selected Filmography: The Basketball Diaries (1995); Fear (1996); Traveller (1997); Boogie Nights (1997); The Big Hit (1998); The Corruptor (1999); Three Kings (1999); The Yards (2000); The Perfect Storm (2000); Planet of the Apes (2001); Rock Star (2001); The Italian Job (2003); I Heart Huckabees (2004); Four Brothers (2005); Invincible (2006)
Martin Sheen (Oliver Queenan) [ IMDb page ]
Birth: August 3, 1940 in Dayton, Ohio
Selected Filmography: The Subject Was Roses (1968); No Drums, No Bugles (1972); Rage (1972); Harry O: Such Dust As Dreams Are Made On (1973); Badlands (1973); The Cassandra Crossing (1976); The Little Girl Who Lives Down the Lane (1976); Apocalypse Now (1979); Eagle's Wing (1979); The Final Countdown (1980); Loophole (1981); Gandhi (1982); That Championship Season (1982); Enigma (1983); Man, Woman and Child (1983); A State of Emergency (1986); The Believers (1987); Da (1988); Judgment in Berlin (1988); Beverly Hills Brats (1989); Cold Front (1989); Beyond the Stars (1989); Cadence (1990); Touch and Die (1991); The Maid (1991); Running Wild (1992); When the Bough Breaks (1993); Hear No Evil (1993); Gettysburg (1993); Trigger Fast (1994); Captain Nuke and the Bomber Boys (1995); Dillinger and Capone (1995); The Break (1995); Gospa (1995); The American President (1995); The War at Home (1996); Entertaining Angels (1996); Spawn (1997); Gunfighter (1998); Stranger in the Kingdom (1998); A Letter From Death Row (1998); No Code of Conduct (1998); Storm (1999); O (2001); Catch Me If You Can (2002); Milost mora (2003); The Commission (2003); Bobby (2006)
Ray Winstone (Mr. French) [ IMDb page ]
Birth: February 19, 1957 in London, England
Selected Filmography: That Summer (1979); Scum (1979); Ladies and Gentlemen, the Fabulous Stains (1981); Tank Malling (1989); Ladybird Ladybird (1994); Yellow (1996); Nil By Mouth (1997); Face (1997); Final Cut (1998); The War Zone (1999); Darkness Falls (1999); Fanny and Elvis (1999); Sexy Beast (2000); Love, Honour and Obey (2000); Ripley's Game (2002); Cold Mountain (2003); Old Street (2004); Everything (2004); King Arthur (2004); Breaking and Entering (2006)
Vera Farmiga (Madolyn) [ IMDb page ]
Birth: August 6, 1973 in Passaic County, New Jersey
Selected Filmography: Return to Paradise (1998); The Opportunists (2000); Autumn in New York (2000); 15 Minutes (2001); Love in the Time of Money (2002); Dummy (2002); Down to the Bone (2004); The Hard Easy (2005); Running Scared (2006); Breaking and Entering (2006); Joshua (2007); Never Forever (2007)
Alec Baldwin (Ellerby) [ IMDb page ]
Birth: April 3, 1958 in Long Island, New York
Selected Filmography: Forever, Lulu (1987); She's Having a Baby (1988); Beetlejuice (1988); Married to the Mob (1988); Working Girl (1988); The Hunt for Red October (1990); Miami Blues (1990); Alice (1990); The Marrying Man (1991); Prelude to a Kiss (1992); Glengarry Glen Ross (1992); Malice (1993); The Getaway (1994); The Shadow (1994); The Juror (1996); Heaven's Prisoners (1996); Ghosts of Mississippi (1996); The Edge (1997); Thick as Thieves (1998); Mercury Rising (1998); The Confession (1999); Scout's Honor (1999); Thomas and the Magic Railroad (2000); Pearl Harbor (2001); The Cooler (2003); Shortcut to Happiness (2003); The Cat in the Hat (2003); Along Came Polly (2004); The Last Shot (2004); The Aviator (2004); Elizabethtown (2005); Fun With Dick and Jane (2005); Mimi's First Time (2006); Running With Scissors (2006); The Good Shepherd (2006); Brooklyn Rules (2006)
Anthony Anderson (Brown) [ IMDb page ]
Birth: August 15, 1970 in Los Angeles, California
Selected Filmography: Life (1999); Big Momma's House (2000); Me, Myself & Irene (2000); Urban Legends: Final Cut (2000); Kingdom Come (2000); See Spot Run (2001); Exit Wounds (2001); Two Can Play That Game (2001); Barbershop (2002); Kangaroo Jack (2003); Cradle 2 the Grave (2003); Malibu's Most Wanted (2003); Scary Movie 3 (2003); My Baby's Daddy (2004); Agent Cody Banks 2: Destination London (2004); Hustle & Flow (2005); King's Ransom (2005); Scary Movie 4 (2006); The Last Stand (2006)
James Badge Dale (Barrigan) [ IMDb page ]
Birth: May 1, 1978
Selected Filmography: Lord of the Flies (1990); Nola (2003); Cross Bronx (2004)