Bill Murray 
 as Peter Venkman

Dan Aykroyd 
 as Ray Stantz

Sigourney Weaver 
 as Dana Barrett

Harold Ramis 
 as Egon Spengler

Rick Moranis 
 as Louis Tully

Annie Potts 
 as Janine Melnitz

William Atherton 
 as Walter Peck

Ernie Hudson 
 as Winston Zeddemore

Slavitza Jovan 
 as Gozer

David Margulies 
 as Mayor

Steven Tash 
 as Male Student

Jennifer Runyon 
 as Female Student

Michael Ensign 
 as Hotel Manager

Alice Drummond 
 as Librarian

Jordan Charney 
 as Dean Yager

Timothy Carhart 
 as Violinist

John Rothman 
 as Library Administrator

Tom McDermott 
 as Archbishop

Roger Grimsby 
 as Roger Grimsby

Larry King 
 as Larry King

Joe Franklin 
 as Joe Franklin

Casey Kasem 
 as Casey Kasem (voice)

John Ring 
 as Fire Commissioner

Norman Matlock 
 as Police Commissioner

Joe Cirillo 
 as Police Captain

Joe Schmieg 
 as Police Seargeant

Reginald VelJohnson 
 as Jail Guard

Rhoda Gemignani 
 as Real Estate Woman

Murray Rubin 
 as Man at Elevator

Larry Dilg 
 as Con Edison Man

Danny Stone 
 as Coachman

Patty Freedman 
 as Woman at Party

Jean Kasem 
 as Tall Woman at Party

Lenny Del Genio 
 as Doorman

Frances E. Nealy 
 as Chambermaid

Sam Moses 
 as Hot Dog Vendor

Christopher Wynkoop 
 as TV Reporter

Winston May 
 as Businessman in Cab

Tommy Hollis 
 as Mayor's Aide

Eda Reiss Merin 
 as Louis's Neighbor

Ric Mancini 
 as Policeman at Apartment

Kathryn Janssen 
 as Mrs. Van Hoffman

Stanley Grover 
 as Reporter

Carol Ann Henry 
 as Reporter

James Hardie 
 as Reporter

Frantz Turner 
 as Reporter

Nancy Kelly 
 as Reporter

Paul Trafas 
 as Ted Fleming

Cheryl Birchenfield 
 as Annette Fleming

Ruth Oliver 
 as Library Ghost

Kymberly Herrin 
 as Dream Ghost

Billy Bryan 
 as Stay Puft Marshmallow Man (uncredited)

Frankie Como 
 as T-Shirt Vendor (uncredited)

Peter Costanza 
 as Man Fleeing Marshmallow Man (uncredited)

John De Bello 
 as Patrolman Matthews (uncredited)

Paddi Edwards 
 as Gozer (voice) (uncredited)

Eldo Ray Estes 
 as Redheaded Man (uncredited)

Brute Force 
 as Hare Krishna acolyte (uncredited)

Debbie Gibson 
 as Birthday Girl in Tavern on the Green (uncredited)

Willow Hale 
 as Student at Columbia University (uncredited)

Jon Hayden 
 as Library Patron (uncredited)

Ron Jeremy 
 as Man Behind Barricade (uncredited)

Joseph Marzano 
 as Man in Taxi (uncredited)

Joe Medjuck 
 as Man at Library (uncredited)

Danny Nero 
 as Reporter (uncredited)

Frank Patton III 
 as City Hall Cop (uncredited)

Harrison Ray 
 as Terror Dog (uncredited)

Ivan Reitman 
 as Zuul / Slimer (voice) (uncredited)

Frank Rivers 
 as Prisoner (uncredited)

Mario Todisco 
 as Prisoner (uncredited)

Bill Walton 
 as Bill Walton (uncredited)

Mark Bryan Wilson 
 as Slimer (uncredited)

George Sasaki 
 as Hotel Guest (uncredited)