Sigourney Weaver
Dana Barrett
Harold Ramis
Egon Spengler
Annie Potts
Janine Melnitz
William Atherton
Walter Peck
Ernie Hudson
Winston Zeddemore
Jennifer Runyon
Female Student
Michael Ensign
Hotel Manager
John Rothman
Library Administrator
Roger Grimsby
Roger Grimsby
Casey Kasem
Casey Kasem (voice)
John Ring
Fire Commissioner
Norman Matlock
Police Commissioner
Joe Cirillo
Police Captain
Joe Schmieg
Police Seargeant
Reginald VelJohnson
Jail Guard
Rhoda Gemignani
Real Estate Woman
Murray Rubin
Man at Elevator
Patty Freedman
Woman at Party
Jean Kasem
Tall Woman at Party
Frances E. Nealy
Chambermaid
Christopher Wynkoop
TV Reporter
Winston May
Businessman in Cab
Eda Reiss Merin
Louis's Neighbor
Ric Mancini
Policeman at Apartment
Kathryn Janssen
Mrs. Van Hoffman
Cheryl Birchenfield
Annette Fleming
Kymberly Herrin
Dream Ghost
Billy Bryan
Stay Puft Marshmallow Man (uncredited)
Matteo Cafiso
Boy at Hot Dog Stand (uncredited)
Frankie Como
T-Shirt Vendor (uncredited)
Peter Costanza
Man Fleeing Marshmallow Man (uncredited)
John De Bello
Patrolman Matthews (uncredited)
Paddi Edwards
Gozer (voice) (uncredited)
Eldo Ray Estes
Redheaded Man (uncredited)
Brute Force
Hare Krishna acolyte (uncredited)
Debbie Gibson
Birthday Girl in Tavern on the Green (uncredited)
Willow Hale
Student at Columbia University (uncredited)
Jon Hayden
Library Patron (uncredited)
Ron Jeremy
Man Behind Barricade (uncredited)
Joseph Marzano
Man in Taxi (uncredited)
Joe Medjuck
Man at Library (uncredited)
Danny Nero
Reporter (uncredited)
Frank Patton III
City Hall Cop (uncredited)
Harrison Ray
Terror Dog (uncredited)
Ivan Reitman
Zuul / Slimer (voice) (uncredited)
Frank Rivers
Prisoner (uncredited)
Mario Todisco
Prisoner (uncredited)
Bill Walton
Bill Walton (uncredited)
Mark Bryan Wilson
Slimer (uncredited)
