Sigourney Weaver Dana Barrett
Bill Murray Peter Venkman
Annie Potts Janine Melnitz
Timothy Carhart Violinist
Dan Aykroyd Screenplay, Ray Stantz
Ernie Hudson Winston Zeddemore
Rick Moranis Louis Tully
William Atherton Walter Peck
Chuck Gaspar Special Effects Supervisor
Harold Ramis Screenplay, Egon Spengler
Casey Kasem Casey Kasem (voice)
Tom McDermott Archbishop
Sam Moses Hot Dog Vendor
Reginald VelJohnson Jail Guard
Ivan Reitman Director, Producer, Zuul / Slimer (voice) (uncredited)
László Kovács Director of Photography
Michael Ensign Hotel Manager
Jordan Charney Dean Yager
John Bruno Visual Effects Art Director
John Rothman Library Administrator
David Margulies Mayor
Kathryn Janssen Mrs. Van Hoffman
Elmer Bernstein Original Music Composer
Larry King Larry King
Joseph E. Thibo First Assistant Camera
Robert M. Stevens Camera Operator
Rhoda Gemignani Real Estate Woman
Tommy Hollis Mayor's Aide
Paddi Edwards Gozer (voice) (uncredited)
Jennifer Runyon Female Student
Norman Matlock Police Commissioner
Gemma La Mana Still Photographer
Les Fresholtz Sound Re-Recording Mixer
Richard Beggs Sound Designer
Joe Medjuck Man at Library (uncredited), Associate Producer
Richard Edlund Visual Effects
Katterli Frauenfelder Second Assistant Director
Dione Taylor Hairstylist
Mario Todisco Prisoner (uncredited)
Larry Holt Stunts
Alice Drummond Librarian
Colin J. Campbell Gaffer
Slavitza Jovan Gozer
Tom Morga Stunt Double
Willow Hale Student at Columbia University (uncredited)
Jim Aupperle Visual Effects Camera
Debbie Gibson Birthday Girl in Tavern on the Green (uncredited)
Eldo Ray Estes Redheaded Man (uncredited)
Bill Walton Bill Walton (uncredited)
Roger Grimsby Roger Grimsby
Frank Patton III City Hall Cop (uncredited)
Frank Rivers Prisoner (uncredited)
Marvin March Set Decoration
Rick Alexander Sound Re-Recording Mixer
Ray Parker, Jr. Theme Song Performance
Leonard Engelman Makeup Artist
Joe Cirillo Police Captain
Billy Bryan Stay Puft Marshmallow Man (uncredited)
Eda Reiss Merin Louis's Neighbor
Stanley Grover Reporter
Ric Mancini Policeman at Apartment
Gene Kearney Key Grip
Jean Kasem Tall Woman at Party
Suzy Benzinger Costume Design
Murray Rubin Man at Elevator
Christopher Wynkoop TV Reporter
David E. Blewitt Editor
Sheldon Kahn Editor
John DeCuir Jr. Art Direction
Danny Nero Reporter (uncredited)
Gene S. Cantamessa Production Sound Mixer
Jack E. Ackerman Property Master