Bill Murray
- Dr. Peter Venkman |
Dan Aykroyd
- Dr. Raymond Stantz |
Sigourney Weaver
- Dana Barrett |
Harold Ramis
- Dr. Egon Spengler |
Rick Moranis
- Louis Tully |
Annie Potts
- Janine Melnitz |
William Atherton
- Walter Peck |
Ernie Hudson
- Winston Zeddemore |
David Margulies
- Mayor |
Steven Tash
- Male Student |
Jennifer Runyon
- Female Student |
Slavitza Jovan
- Gozer |
Michael Ensign
- Hotel Manager |
Alice Drummond
- Librarian |
Jordan Charney
- Dean Yager |
Timothy Carhart
- Violinist |
John Rothman
- Library Administrator |
Tom McDermott
- Archbishop |
Roger Grimsby
- Self |
Larry King
- Self |
Joe Franklin
- Self |
Casey Kasem
- Self |
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 |
Larry Dilg
- Con Edison Man |
Danny Stone
- Coachman |
Patty Dworkin
- Woman at Party |
Jean Kasem
- Tall Woman at Party |
Lenny Del Genio
- Doorman |
Frances E. Nealy
- Chambermaid |
Sam Moses
- Hot Dog Vendor |
Christopher Wynkoop
- TV Reporter |
Winston May
- Businessman in Cab |
Tommy Hollis
- Mayor's Aide |
Eda Reiss Merin
- Louis's Neighbor |
Ric Mancini
- Policeman at Apartment |
Kathryn Janssen
- Mrs. Van Hoffman |
Stanley Grover
- Reporter |
Carol Ann Henry
- Reporter |
James Hardie
- Reporter |
Frantz Turner
- Reporter |
Nancy Kelly
- Reporter |
Paul Trafas
- Ted Fleming |
Cheryl Birchenfield
- Annette Fleming |
Ruth Oliver
- Library Ghost |
Kymberly Herrin
- Dream Ghost |
Murray Bandel
- Extra - NY Public Library (uncredited) |
Larry Bilzarian
- Prisoner (uncredited) |
Billy Bryan
- Stay Puft Marshmallow Man (uncredited) |
Matteo Cafiso
- Boy at Hot Dog Stand (uncredited) |
Larry Chain
- Man (uncredited) |
Frankie Como
- T-Shirt Vendor (uncredited) |
Peter Costanza
- Man Fleeing Marshmallow Man (uncredited) |
James 'Hotfeet' Davis
- Soldier (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
- Self |
Manny Weltman
- Party Guest (uncredited) |
Mark Bryan Wilson
- Slimer (uncredited) |