Billy Bob Thornton as Jasper Woodcock

Seann William Scott as John Farley

Susan Sarandon as Beverly Farley

Amy Poehler as Maggie

Ethan Suplee as Nedderman

Melissa Sagemiller as Tracy

Melissa Leo as Sally Jansen

Jacob Davich as Nedderman's Brother

Tyra Banks as Self

Jack Walsh as Palumbo

Alec George as Young Nedderman

Allisyn Snyder as Scout Girl

M.C. Gainey as Hal - Barber #1

Brent Briscoe as Barber #2

Jennifer Aspen as Cindy the Realtor

Brad Beyer as Jay Elms - Dumb Jock

Joshua Feinman as Marine

Carissa Kosta as Farley Stalker

Googy Gress as Earnest Man

Emily Wagner as Cheery Woman

Lyle Kanouse as Carnie #1

Stephen Monroe Taylor as Oates

Michael Santorico as Waiter at Barone's

Kurt Fuller as Councilman Luke

Lisa K. Wyatt as Housewife

Van Epperson as Carnie #2

Scott Adsit as Cheesy Salesman

Max Van Ville as Pizza Waiter

Alisha Gaddis as Parade Goer (uncredited)

Dave Kuhr as Bookish Guy