Bill Murray

Peter Venkman

Dan Aykroyd

Ray Stantz

Sigourney Weaver

Dana Barrett

Harold Ramis

Egon Spengler

Rick Moranis

Louis Tully

Annie Potts

Janine Melnitz

William Atherton

Walter Peck

Ernie Hudson

Winston Zeddemore

Slavitza Jovan

Gozer

David Margulies

Mayor

Steven Tash

Male Student

Jennifer Runyon

Female Student

Michael Ensign

Hotel Manager

Alice Drummond

Librarian

Jordan Charney

Dean Yager

Timothy Carhart

Violinist

John Rothman

Library Administrator

Tom McDermott

Archbishop

Roger Grimsby

Roger Grimsby

Larry King

Larry King

Joe Franklin

Joe Franklin

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

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

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)