Mark Wahlberg as Micky Ward

Christian Bale as Dicky Eklund

Amy Adams as Charlene Fleming

Melissa Leo as Alice Ward

Mickey O'Keefe as Mickey O'Keefe

Jack McGee as George Ward

Melissa McMeekin as "Little Alice" Eklund

Bianca Hunter as Cathy "Pork" Eklund

Erica McDermott as Cindy "Tar" Eklund

Jill Quigg as Donna Eklund Jaynes

Dendrie Taylor as Gail "Red Dog" Eklund

Kate B. O'Brien as Phyllis "Beaver" Eklund

Jenna Lamia as Sherri Ward

Frank Renzulli as Sal Lanano

Paul Campbell as Gary "Boo Boo" Giuffrida

Caitlin Dwyer as Kasie Ward

Chanty Sok as Karen

Ted Arcidi as Lou Gold

Ross Bickell as Mike Toma

Sean Malone as Wolfie

José Antonio Rivera as Gilberto Brown aka Jose

Richard Farrell as HBO Cameraman #1

Matthew Muzio as HBO Cameraman #2

Steven Barkhimer as HBO Producer

Art Ramalho as Art Ramalho

Sugar Ray Leonard as Sugar Ray Leonard

Jackson Nicoll as Little Dicky

Alison Folland as Laurie Carroll

Sean Patrick Doherty as Jimmy (Laurie's Husband)

Sue Costello as Becky

Thomas Benton as Businessman

Ray Greenhalge as Ray Ramalho

Tino Kimly as Pran

Epifanio Melendez as Carlos Garcia

Jeremiah Kissel as Bald Businessman

Sean Eklund as Man in Diner

Roeun Chea as Chan

Brian Nguyen as Brian

Rikki Kleiman as Court Clerk

Michael Dell'Orto as WBU Commissioner

Paul Locke as Reporter #1

Kim Carrell as Reporter #2

Colin Hamell as John Hyland

Dale Place as Referee Micky Vann

Eddie Lee Anderson as Referee Joe Cortez

Joe Lupino as Referee Mitch Halpern

Bonnie Aarons as Crackhead Bonnie

Walter Driscoll as Court Officer

Matt Russell as Photo Guy On Street

A. Joseph Denucci as Man on Street #1

Dicky Eklund as Man on Street #2

George Michael Ward as Man on Street #3

Dicky Eklund Jr. as Man on Street #4

Jack Greenhalge as Man on Street #5

Kevin Paige as Man on Street #6

David A. Ramalho Sr. as Trainer

Ziad Akl as Inmate

Simon Hamlin as Movie Patron

Gerald Greenhalge as Uncle Jerry

Matthew Russell as Running Kid #1

Tommy Eklund as Running Kid #2

Rita Mercier as Woman on Street #1

Deborah Bolanger as Woman on Street #2

Kerry Moore as Woman on Street #3

Philip Dorn Hebert as Micky's Cutman

Raul Vera as Sanchez Trainer

Jack Lally as Neary Trainer

Carlos L. Smith as Sugar Ray Leonard Bodyguard

Lee Wesley as Fight Spectator #1

Hugh Long as Fight Spectator #2

Catherine Lynn Stone as Fan

Eric Weinstein as Micky's Friend

Bo Cleary as Cop

Anthony Molinari as Neary

Peter Cunningham as Mike "Machine Gun" Mungin

Miguel Espino as Alfonso Sanchez

Anthony "Ace" Thomas as Castillo

Brian Christensen as Drunk Guy

Jen Weissenberg as Drunk Girl

Michael Buffer as Fight Announcer

Larry Merchant as Fight Announcer

Jim Lampley as Fight Announcer

Emanuel Steward as Fight Announcer

Roy Jones Jr. as Fight Announcer

George Foreman as Fight Announcer

Don Dunphy as Fight Announcer

James Donnelly as Donut Shop Patron (uncredited)

Al Conti as Larry Merchant (uncredited)

Dannielle Rose as Ringside Spectator (uncredited)