| cast |
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| Series Regulars | |||
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| Adam Brody | Adam Brody as Seth Cohen | Alan Dale | Alan Dale as Caleb Nichol |
| Autumn Reeser | Autumn Reeser as Taylor Townsend | Ben McKenzie | Ben McKenzie as Ryan Atwood |
| Kelly Rowan | Kelly Rowan as Kirsten Cohen | Melinda Clarke | Melinda Clarke as Julie Cooper |
| Mischa Barton | Mischa Barton as Marissa Cooper | Peter Gallagher | Peter Gallagher as Sandy Cohen |
| Rachel Bilson | Rachel Bilson as Summer Roberts | Tate Donovan | Tate Donovan as Jimmy Cooper |
| Willa Holland | Willa Holland as Kaitlin Cooper | | |
| |||
| Recurring & Guests | |||
| |||
| Amanda Righetti | Amanda Righetti as Hailey Nichol | Cam Gigandet | Cam Gigandet as Kevin Volchok |
| Chris Carmack | Chris Carmack as Luke Ward | Jeri Ryan | Jeri Ryan as Charlotte Morgan |
| Michael Cassidy | Michael Cassidy as Zach Stevens | Michael Nouri | Michael Nouri as Dr. Neil Roberts |
| Nikki Reed | Nikki Reed as Sadie Campbell | Olivia Wilde | Olivia Wilde as Alex Kelly |
| Samaire Armstrong | Samaire Armstrong as Anna | Shannon Lucio | Shannon Lucio as Lindsay Gardner |
| Taylor Handley | Taylor Handley as Oliver Trask | | |