 | Hilary Swank als Erin Gruwell |
 | Scott Glenn als Steve Gruwell |
 | Imelda Staunton als Margaret Campbell |
 | Patrick Dempsey als Scott Casey |
 | April Hernandez Castillo als Eva Benitez |
 | Robert Wisdom als Dr. Carl Cohn |
 | John Benjamin Hickey als Brian Gelford |
 | Pat Carroll als Miep Gies |
 | Hunter Parrish als Ben |
 | Kristin Herrera als Gloria Munez |
 | Jaclyn Ngan als Sindy |
| Sergio Montalvo als Alejandro Santiago |
| Jason Finn als Marcus |
| Deance Wyatt als Jamal Hill |
| Vanetta Smith als Brandy Ross |
 | Gabriel Chavarria als Tito |
| Antonio García als Miguel |
 | Giovonnie Samuels als Victoria |
| Will Morales als Paco |
| Armand Jones als Grant Rice |
 | Ricardo Molina als Eva's Father |
 | Angela Alvarado als Eva’s Mother |
 | Liisa Cohen als Brandy's Mother |
 | Tim Halligan als Principal Banning |
| Renee Firestone als Herself - Holocaust survivor |
| Eddie Ilam als Himself - Holocaust Survivor |
| Elisabeth Mann als Herself - Holocaust Survivor |
| Gloria Ungar als Herself - Holocaust Survivor |
 | Dan Warner als Cop #1 |
 | Randy Hall als Cop #2 |
 | Carl Paoli als Cop #3 |
| Mario als Andre Bryant |
| Richard LaGravenese | Director |
| Richard LaGravenese | Screenplay |
| Erin Gruwell | Novel |
| Danny DeVito | Producer |
| Michael Shamberg | Producer |
| Stacey Sher | Producer |
| Jim Denault | Director of Photography |
| Margery Simkin | Casting |
| David Moritz | Editor |
| Brenda Lopez | Script Supervisor |
| Hilary Swank | Executive Producer |
| Tracey Durning | Executive Producer |
| Nan Morales | Executive Producer |
| Daniel S. Levine | Executive Producer |
| Laurence Bennett | Production Design |
| Cindy Evans | Costume Design |
| Mark Isham | Music |
| Will.i.am | Music |
| Mary Ramos | Music Supervisor |
| Leigh Shanta | Unit Production Manager |
| William Morts | Stunt Coordinator |
| Jordana Glick-Franzheim | Associate Producer |
| Peter Borck | Art Direction |
| Linda Lee Sutton | Set Decoration |
| Patrick Rousseau | Camera Operator |
| Geoffrey Haley | Camera Operator |
| Geoffrey Haley | Steadicam Operator |
| David Parker | Sound Mixer |
| Don Coufal | Boom Operator |
| Thomas Mertz | Special Effects Coordinator |
| Gregory Alpert | Location Manager |
| Marisa Aboitiz | Costume Supervisor |
| Deborah Zimmerman | Set Costumer |
| Katherine Wright | Set Costumer |
| Beverly Jo Pryor | Makeup Department Head |
| Debra Denson | Makeup Artist |
| Candy L. Walken | Hair Department Head |
| Bonnie Clevering | Hairstylist |
| Jason Green | Key Hair Stylist |
| Yvonne Depatis-Kupka | Hairstylist |
| Lucas Borghi | Assistant Editor |
| Tina Anderson | Post Production Supervisor |
| Julianne Weiss | Casting Associate |
| Macie Vener | Assistant Art Director |
| Thomas Betts | Set Designer |
| Linda Griffis | Art Department Coordinator |
| Charlie Bolwell | Production Coordinator |
| Heidi Falconer | Unit Publicist |
| Jaimie Trueblood | Still Photographer |
| Per Hallberg | Supervising Sound Editor |
| Karen Baker Landers | Supervising Sound Editor |
| Scott Millan | Sound Re-Recording Mixer |
| Michael Keller | Sound Re-Recording Mixer |
| Christopher Assells | Sound Effects Editor |
| Dan Hegeman | Sound Effects Editor |
| Dino DiMuro | Sound Effects Editor |
| Carlton Kaller | Music Editor |
| Jason Ruder | Music Editor |
| Dan Schmit | Visual Effects Supervisor |
| Michael Caplan | Visual Effects Producer |
| Frederick H. Stahly | Dialogue Editor |
| Thomas O'Neil Younkman | Dialogue Editor |
| Susan Kurtz | Dialogue Editor |
| Kerry Dean Williams | ADR Supervisor |
| Paul Timothy Carden | Dialogue Editor |
| J.P. Jones | Property Master |
| Boni Yanagisawa | Stunts |
| Chrissy Weathersby Ball | Stunts |
| Jose Vasquez | Stunts |
| Stan Tinay | Stunts |
| Larnell Stovall | Stunts |
| Sam Situmorang | Stunts |
| Marcus Salgado | Stunts |
| Hayley C. Rosales | Stunts |
| Darryl Reeves | Stunts |
| Austin Priester | Stunts |
| Jane Oshita | Stunts |
| Lin Oeding | Stunts |
| Vanessa Motta | Stunts |
| Delma Miranda | Stunt Double |
| John Koyama | Stunts |
| Natascha Hopkins | Stunts |
| Steven Ho | Stunts |
| Jason Finn | Stunts |
| Eddie J. Fernandez | Stunts |
| Roel Failma | Stunts |
| Marly Coronel | Stunts |
| Jwaundace Candece | Stunts |
| Sonny Mario Ayon | Stunts |
| Greg Anthony | Stunts |
| Don Cheadle | Thanks |
| Armand Jones | In Memory Of |
| Mike Malone | Set Dresser |
| Janet Brady | Stunts |
| Sharon Schaffer | Stunts |
| Eugene Collier | Stunts |
| Sean A. Rosales | Stunts |
| Freedom Writers | Book |
