| Greg |
Baxton | A hockey player |
| Rob |
Delaney | Aaron's best friend |
| Cassidy |
Donovan | Hannah's singing duet. Aka: Cass |
| Dean |
Farrow | The Briar School's dean |
| Garrett |
Graham | Star athlete; one of the narrators |
| Phil |
Graham | Garrett's father |
| Dean |
Heyward-Di Laurentis | Garrett's housemate |
| Mary |
Jane | One of Hannah's colleagues |
| Ollie |
Jankowitz | One of Garrett's acquaintances |
| Justin |
Kohl | Hannah's crush |
| Jennifer |
Lawrence | American actress |
| John |
Logan | Garrett's roommate |
| Beau |
Maxwell | The quarterback star |
| Joanna |
Maxwell | Beau's sister |
| Jimmy |
Paulson | One of Hannah's classmates |
| Pamela |
Tolbert | Hannah's professor |
| Hannah |
Wells | Protagonist |
| Aaron |
| The boy who raped Hannah |
| Allie |
| Hannah's roommate |
| Birdie |
| Garrett's teammate |
| Carole |
| Hannah's former psychiatrist |
| Cindy |
| Phil's girlfriend |
| Dana |
| Teaching assistant |
| Devon |
| Hannah's ex-boyfriend |
| Dexter |
| Hannah's friend |
| Emily |
| Devon's new girlfriend |
| Hollis |
| Garrett's teammate |
| Jae |
| Hannah's cellist |
| Jensen |
| Garrett's hockey coach |
| Julio |
| The night cook |
| Katie |
| Allie's friend |
| Kendall |
| Garrett's ex-girlfriend |
| Lisa |
| One of Hannah's friends |
| Mark |
| Hannah's uncle |
| Napoleon |
| Hannah's dog |
| Natalie |
| Birdie's girlfriend |
| Nell |
| Hannah's classmate |
| Nicole |
| Hannah's aunt |
| Niko |
| Garrett's teammate |
| Pierre |
| Garrett's teammate |
| Sean |
| Allie's boyfriend |
| Shawna |
| Allie's friend |
| Susan |
| Friend of Hannah's mother |
| Tracy |
| Hannah's housemate |
| Tracy |
| Hannah's close friend |
| Tucker |
| Garrett's roommate |
