Reed Diamond is an American actor, best known as Damien Karp on TNT's Franklin & Bash, Jason Pillar on FOX's 24, Stuart Collins on ABC's Judging Amy, and Detective Mike Kellerman on NBC's Homicide: Life on the Street. Other television credits include Harold Balinger on FOX's Wayward Pines, Daniel Whitehall on ABC's Agents of Shield, Ray Haffner on CBS' The Mentalist, and Laurence Dominic on FOX's Dollhouse.

Film credits include Much Ado About Nothing, Moneyball, Meet Bill, Adrenaline, Faceless, Madison, Spider-Man 2, S.W.A.T., Clear and Present Danger, and Good Night, and Good Luck.

Theatre credits include his Broadway debut as Joey in The Homecoming (Criterion Center Stage); and regionally, as Walker/Ned in Three Days of Rain (Old Globe Theatre).