Leonardo DiCaprio

William 'Billy' Costigan, Jr.

Acting

Matt Damon

Staff Sgt. Colin Sullivan

Acting

Jack Nicholson

Francis 'Frank' Costello

Acting

Mark Wahlberg

Staff Sgt. Sean Dignam

Acting

Vera Farmiga

Dr. Madolyn Madden

Acting

Martin Sheen

Capt. Oliver Charles Queenan

Acting

Ray Winstone

Mr. Arnold 'Frenchy' French

Acting

Anthony Anderson

Trooper Brown

Acting

Alec Baldwin

Capt. George Ellerby

Acting

Kevin Corrigan

Cousin Sean

Acting

James Badge Dale

Barrigan

Acting

David O'Hara

Fitzy

Acting

Mark Rolston

Delahunt

Acting

Robert Wahlberg

Lazio (FBI)

Acting

Kristen Dalton

Gwen

Acting

Thomas B. Duffy

Govenor

Acting

Richard Hughes

Uncle Edward

Acting

J.C. MacKenzie

Realtor

Acting

Mary Klug

Billy's Aunt

Acting

Peg Holzemer

Mrs. Kennefick

Acting

Robert 'Toshi' Kar Yuen Chan

Triad Boss

Acting

Gurdeep Singh

Pakistani Proprietor

Acting

Armen Garo

Providence Gangster #1

Acting

John Cenatiempo

Providence Gangster #2

Crew

Joseph Riccobene

Kneecapped Bankrobber

Acting

Billy Smith

Detective #1 Tailing Queenan

Acting

Lyman Chen

Translator

Acting

Kevin P. McCarthy

Detective #1 - Colin's Unit

Acting

Chris Fischer

Detective #2 - Colin's Unit

Acting

Brian Smyj

Man Glassed in Bar

Crew

William Severs

Older Priest

Acting

Larry Mitchell

Younger Priest

Acting

Anthony Estrella

Police Camera Tech

Acting

Andrew Breving

Police Cell Phone Tech

Acting

Tracey Paleo

Darlene the Secretary

Acting

Douglas Crosby

Man Killed by French

Crew

Dorothy Lyman

Woman at Bar #1

Acting

Audrie Neenan

Woman at Bar #2

Acting

Frank Mallicoat

News Anchor

Acting

Paula DeMers

Billy's Mother

Acting

Conor Donovan

Young Colin

Acting

Amanda Lynch

Carmen

Acting

Sallie Toussaint

Woman at Opera

Acting

Patrick Coppola

Bookie Harassed by French

Production

Mick O'Rourke

Jimmy Bags

Crew

Deborah Carlson

Sister Mary Theresa

Acting

Nellie Sciutto

Queenan's Secretary

Acting

Peter Welch

Other Prisoner

Acting

Henry Yuk

Chinese Government Man

Acting

Dennis Lynch

Costello's Crew #1

Acting

Michael Byron

Costello's Crew #2

Acting

William Lee

Costello's Crew #3

Acting

John Rue

Luncheonette Proprietor

Acting

Peter Crafts

Man in Costello's Bar

Acting

Joseph P. Reidy

Priest with Young Colin

Directing

John Farrer

Priest at Billy's Funeral

Acting

Paris Karounos

Jimmy Pappas

Acting

Brian Haley

Detective #2 Tailing Queenan

Acting

Terry Serpico

Detective #3 Tailing Queenan

Acting

Jay Giannone

Detective #4 Tailing Queenan

Acting

John Polce

Lynn Detective

Crew

Bo Cleary

Drill Instructor #2 (voice)

Acting

David Conley

Gang Member with Mr. French

Acting

Victor Chan

Chinese Delivery Man

Crew

Jill Brown

Executed Woman

Crew

Sarah Fearon

French's Wife

Acting

Denece Ryland

Woman Doctor

Acting

Zachary Pauliks

Young Billy

Acting

Daniel F. Risteen, Jr.

Crack House Cop #1

Acting

Francis P. Hughes

Crack House Cop #2

Acting

Johnny Cicco

Crack Addict

Acting

Chance Kelly

Exam Instructor

Acting

Shay Duffin

Bartender at Brasserie

Acting

John McConnell

Bookie in Costello's Bar

Acting

Kenneth Stoddard

State Trooper #1

Acting

Jeffrey Winter

State Trooper #2

Acting

Paddy Curran

New Guy

Acting

Mark Philip Patrick

New Guy

Crew

David Fischer

Executed Man

Directing

Walter Y.F. Wong

Waiter in Alley

Acting

Tony M. Yee

Waiter in Alley

Acting

Francesca Scorsese

Little Girl at Airport

Acting

Alex Morris

Young Man at Airport

Acting

Emma Tillinger Koskoff

Woman with Dog

Production

Craig 'Radioman' Castaldo

Crack House Denizen

Acting

Takumi Bando

Triad (uncredited)

Acting

Eric Bruno Borgman

Reporter (uncredited)

Acting

Brendan Burke

Irish Thug (uncredited)

Acting

Chris Chinn

Gang Member (uncredited)

Acting

Jeffrey Corazzini

Crime Scene Unit (uncredited)

Acting

Jim Ford

Cadet (uncredited)

Acting

Trudi Goodman

Woman Office Worker (uncredited)

Acting

Steve Lord

Academy Pistol Coach (uncredited)

Acting

Jack McCullough

EMT (uncredited)

Acting

Osmani Rodriguez

Reporter (uncredited)

Acting

Lawrence Cameron Steele

Academy Firearms Instructor (uncredited)

Acting

Conor Timmis

Rugby Fan (uncredited)

Acting

Joseph Oliveira

Officer (uncredited)

Acting

Adam Masnyk

Southie Teen / Soccer Player (uncredited)

Acting

John Franchi

Pedestrian (uncredited)

Acting

Paul McGillicuddy

Subway Passenger (uncredited)

Acting

Kim Carrell

MA State Police Detective

Acting

Rebecca Love

Adult Film Actress (uncredited)

Acting