Jack Nicholson character Francis "Frank" Costello
Leonardo DiCaprio character William "Billy" Costigan, Jr.
Matt Damon character Staff Sgt. Colin Sullivan
Mark Wahlberg character Staff Sgt. Sean Dignam
Vera Farmiga character Dr. Madolyn Madden
Martin Sheen character Capt. Oliver Charles Queenan
Ray Winstone character Arnold "Frenchy" French
Anthony Anderson character Trooper Brown
Alec Baldwin character Capt. George Ellerby
Kevin Corrigan character Cousin Sean
James Badge Dale character Barrigan
David O'Hara character Fitzy
Robert Wahlberg character Lazio
Kristen Dalton character Gwen
Thomas B. Duffy character Govenor
Richard Hughes character Uncle Edward
Chance Kelly character Exam Instructor
Larry Mitchell character Younger Priest
Mark Rolston character Delahunt
J. C. MacKenzie character Realtor
Mary Klug character Billy's Aunt
Robert 'Toshi' Kar Yuen Chan character Triad Boss
Peg Holzemer character Mrs. Kennefick
Gurdeep Singh character Pakistani Proprietor
Armen Garo character Providence Gangster #1
John Cenatiempo character Providence Gangster #2
Brian Smyj character Man Glassed in Bar
William Severs character Older Priest
Douglas Crosby character Man Killed by French
Dorothy Lyman character Woman at Bar #1
Audrie Neenan character Woman at Bar #2
Conor Donovan character Young Colin
Patrick Coppola character Bookie Harassed by French
Mick O'Rourke character Jimmy Bags
Nellie Sciutto character Queenan's Secretary
Henry Yuk character Chinese Government Man
John Rue character Luncheonette Proprietor
Joseph P. Reidy character Priest with Young Colin
John Farrer character Priest at Billy's Funeral
Billy Smith character Detective #1 Tailing Queenan
Brian Haley character Detective #2 Tailing Queenan
Terry Serpico character Detective #3 Tailing Queenan
Jay Giannone character Detective #4 Tailing Queenan
David Conley character Gang Member with Mr. French
Tracey Paleo character Darlene the Secretary
Jill Brown character Executed Woman
Tom Kemp character Billy Costigan, Sr. (credit only)
Kevin P. McCarthy character Detective #1 - Colin's Unit
Chris Fischer character Detective #2 - Colin's Unit
Joseph Riccobene character Kneecapped Bankrobber
Johnny Cicco character Crack Addict
Lyman Chen character Translator
Shay Duffin character Bartender at Brasserie
David Fischer character Executed Man
Emma Tillinger Koskoff character Woman with Dog
Craig 'Radioman' Castaldo character Crack House Denizen
Francesca Scorsese character Little Girl at Airport
Dennis Lynch character Costello's Crew #1
Michael Byron character Costello's Crew #2
Takumi Bando character Triad (uncredited)
Eric Bruno Borgman character Reporter (uncredited)
Brendan Burke character Irish Thug (uncredited)
Chris Chinn character Gang Member (uncredited)
Jeffrey Corazzini character Crime Scene Unit (uncredited)
Jim Ford character Cadet (uncredited)
Trudi Goodman character Woman Office Worker (uncredited)
Steve Lord character Academy Pistol Coach (uncredited)
Jack McCullough character EMT (uncredited)
Osmani Rodriguez character Reporter (uncredited)
Lawrence Cameron Steele character Academy Firearms Instructor (uncredited)
Conor Timmis character Rugby Fan (uncredited)
Joseph Oliveira character Officer (uncredited)
Adam Masnyk character Southie Teen / Soccer Player (uncredited)
John Franchi character Pedestrian (uncredited)
Paul McGillicuddy character Subway Passenger (uncredited)
Kim Carrell character MA State Police Detective
Robert Myers character Cadet Parent (uncredited)
Rebecca Love character Adult Film Actress (uncredited)
