Jason Biggs as Jim Levenstein

Alyson Hannigan as Michelle Levenstein

Seann William Scott as Steve Stifler

Chris Klein as Chris 'Oz' Ostreicher

Thomas Ian Nicholas as Kevin Myers

Tara Reid as Victoria 'Vicky' Lathum

Mena Suvari as Heather

Eddie Kaye Thomas as Paul Finch

John Cho as John

Jennifer Coolidge as Stifler's Mom

Eugene Levy as Jim's Father

Natasha Lyonne as Jessica

Dania Ramirez as Selena

Katrina Bowden as Mia

Ali Cobrin as Kara

Shannon Elizabeth as Nadia

Chris Owen as Chuck Sherman

Justin Isfeld as Justin

Neil Patrick Harris as Celebrity Dance-Off Host

Molly Cheek as Jim's Mother

Jesse Malinowski as Kyle

Pam Green as Ali

Valarie Kobrovsky as Prateek's Hot Girlfriend

Chuck Hittinger as AJ

Jay Harrington as Dr. Ron

Charlene Amoia as Ellie

Robert Hayes as Bo

Vik Sahay as Prateek Duraiswamy

Stevie Ray Dallimore as Kara's Dad

Kim Wall as Kara's Mom

Jennifer Sun Bell as Madison

Autumn Dial as Alexa

Rebecca Field as Loni

Vince Pisani as Male Alum

Jen Kober as Ingrid

Raheem Babalola as Deshaun

Benjamin Arthur as Chester

Hart Turner as Reed

Matt Mangum as Adam

Brian Mahoney as Police Officer

Helenna Santos as Oz Fan

Michael Beasley as Reggie

Jenna Willis as Computer (voice)

Jeremy Ambler as MILF Guy at Bar (uncredited)

Walter Hendrix III as Celebrity Dance-Off Patron (uncredited)

Ashlyn Henson as Young Loni Lipstein (uncredited)

Rebecca De Mornay as Finch's Mom (uncredited)

Chad Johnson as Chad Ochocinco

George Christopher Bianchi as Evan

Terri James as Female Alum

Zane Wind as Mitch

Randy Hurwitz as Mom at Party

Joseph Kaiser as Jim (13 yrs.)

Michael May as Stifler (13 yrs.)

Logan Van Sickle as Oz (13 yrs.)

Chase Krepp as Kevin (13 yrs.)

Maximiliano Wissinger as Finch (13 yrs.)

John Jason Bailey as Random Alumni

Elizabeth Hurwitz as Baby at Party

Rod C. Rich as Bar Mitzvah Dad

Tanner Baker as Bargoer (uncredited)

Chance Bartels as Stifler's Co-Worker (uncredited)

Wendy Bell as Random Alumni (uncredited)

Courtney Bowers as Teen Partygoer (uncredited)

Holly Britt as Street Girl (uncredited)

Brittany Lee Hellmeister as Kara's Friend (uncredited)

Jon Hurwitz as Dad at Party (uncredited)

Adam C. Johnson as Party Goer (uncredited)

Scott Ledbetter as Jilly (uncredited)

Melanie Kay Turner as Female Alum (uncredited)

Brandon A. Ulman as High School Beach-goer (uncredited)

Lyndsay Wrensen as Upscale Party Guest (uncredited)