- Mark Wahlberg
- Micky Ward, Producer
- Christian Bale
- Dicky Eklund
- Amy Adams
- Charlene Fleming
- Melissa Leo
- Alice Ward
- Jack McGee
- George Ward
- Mickey O'Keefe
- Melissa McMeekin
- "Little Alice" Eklund
- Bianca Hunter
- Cathy "Pork" Eklund
- Erica McDermott
- Cindy "Tar" Eklund
- Jill Quigg
- Donna Eklund Jaynes
- Dendrie Taylor
- Gail "Red Dog" Eklund
- Kate B. O'Brien
- Phyllis "Beaver" Eklund
- Jenna Lamia
- Sherri Ward
- Frank Renzulli
- Sal Lanano
- Paul Campbell
- Gary "Boo Boo" Giuffrida
- Caitlin Dwyer
- Kasie Ward
- Chanty Sok
- Karen
- David O. Russell
- Director
- Scott Silver
- Screenwriter
- Paul Tamasy
- Producer, Screenwriter
- Eric Johnson
- Executive Producer, Screenwriter
- David Hoberman
- Producer
- Todd Lieberman
- Producer
- Ryan Kavanaugh
- Producer
- Mark Wahlberg
- Micky Ward, Producer
- Dorothy Aufiero
- Producer
- Tucker Tooley
- Executive Producer
- Darren Aronofsky
- Executive Producer
- Leslie Varrelman
- Executive Producer
- Keith Dorrington
- Executive Producer
- Michael Brook
- Original Music
- Hoyte Van Hoytema
- Cinematographer
- Pamela Martin
- Film Editing
- Judy Becker
- Production Design
- Laura Ballinger
- Art Director
- Gene Serdena
- Set Decoration
- Sheila Jaffe
- Casting
- Mark Bridges
- Costume Design
