John Belushi as John 'Bluto' Blutarski

Karen Allen as Katy

Tom Hulce as Larry 'Pinto' Kroger

Stephen Furst as Kent 'Flounder' Dorfman

Mark Metcalf as Doug Neidermeyer

Mary Louise Weller as Mandy Pepperidge

Martha Smith as Barbara Sue 'Babs' Jansen

John Vernon as Dean Vernon Wormer

James Daughton as Greg Marmalard

Kevin Bacon as Chip Diller

Tim Matheson as Eric 'Otter' Stratton

Verna Bloom as Marion Wormer

Cesare Danova as Mayor Carmine DePasto

Peter Riegert as Donald 'Boon' Schoenstein

James Widdoes as Robert Hoover

Bruce McGill as Daniel Simpson Day

DeWayne Jessie as Otis Day

Sarah Holcomb as Clorette DePasto

Lisa Baur as Shelly

Donald Sutherland as Dave Jennings

Douglas Kenney as Stork

Chris Miller as Hardbar

Bruce Bonnheim as B.B.

Joshua Daniel as Mothball

Sunny Johnson as Otter's Co-Ed

Stacy Grooman as Sissy

Eliza Roberts as Brunella

Aseneth Jurgenson as Beth

Katherine Denning as Noreen

Raymone Robinson as Mean Dude

Robert Elliott as Meaner Dude

Reginald Farmer as Meanest Dude

Jebidiah R. Dumas as Gigantic Dude

Priscilla Lauris as Dean's Secretary

Rick Eby as Omega

John Freeman as Man On Street

Sean McCartin as Lucky Boy

Helen Vick as Sorority Girl

Rick Greenough as Mongol

Stephen Bishop as Charming Guy with Guitar

John Landis as Cafeteria Dishwasher