Bill Murray as Peter Venkman

Dan Aykroyd as Ray Stantz

Sigourney Weaver as Dana Barrett

Harold Ramis as Dr. Egon Spengler

Rick Moranis as Louis Tully

Ernie Hudson as Winston Zeddemore

Annie Potts as Janine Melnitz

Peter MacNicol as Dr. Janosz Poha

Harris Yulin as Judge Wexler

David Margulies as Mayor Lenny

Kurt Fuller as Jack Hardemeyer

Janet Margolin as The Prosecutor

Wilhelm von Homburg as Vigo

William T. Deutschendorf as Baby Oscar

Henry J. Deutschendorf II as Baby Oscar

Michael P. Moran as Frank the Doorman

Olivia Ward as Meter Maid

Mordecai Lawner as Man with a Ticket

Susanna Boehm as Young Woman on Crutches

Mary Ellen Trainor as Brownstone Mother

Christopher Villaseñor as Brownstone Boy #1

Jason Reitman as Brownstone Boy #2

Aaron Lustig as Norman the Producer

Page Leong as Spengler's Assistant

Mark Schneider as Arguing Couple

Valery Pappas as Arguing Couple

Catherine Reitman as Girl with Puppy

Dave Florek as First Cop

Richard Foronjy as Con Ed Supervisor

George P. Wilbur as Bailiff

Sharon Kramer as Stenographer

Walter Flanagan as Rudy the Museum Guard

Bobby Brown as Mayor's Doorman

Christopher Neame as Maitre D'

Judy Ovitz as Slimed Restaurant Patron

Tom Dugan as Restaurant Cop #1

Angelo Dimascio as Restaurant Cop #2

Robert Alan Beuth as Store Manager

Ralph Monaco as Police Sergeant

Ron Cummins as Police Lieutenant

Cheech Marin as Dock Supervisor

Yvette Cruise as Maria, Dana's Maid

John Hammil as Detective #1

Ray Glanzmann as Detective #2

Alex Zimmerman as Detective #3

Brian Doyle-Murray as Psychiatrist

Louise Troy as Woman with Fur Coat

Douglas Seale as Plaza Hotel Man

Ben Stein as Public Works Official

Erik Holland as Fire Commissioner

Philip Baker Hall as Police Commissioner

Steve Baker as Telephone Man (uncredited)

Trish Cook as Nun at Statue of Liberty (uncredited)

Kevin Dunn as Milton Angland (uncredited)

Ryan Francis as Brownstone Boy #3 (uncredited)

Tyra Reneé Fuller as Driver (uncredited)

Jim Fyfe as Scoleri Brother / Ghost Jogger (uncredited)

George Gerard as Man in Cab (uncredited)

Donna Guidry as Art Restoration Student (uncredited)

Tim Lawrence as Scoleri Brother (uncredited)

Peter Papageorgio as Spectator (uncredited)

Kariim Ratcliff as Crowd Member (uncredited)

Ivan Reitman as Man Walking Outside Firehouse / Slimer (voice) (uncredited)

Ira S. Rosenstein as Stage Manager (uncredited)

Felix Silla as Courtroom Spectator (uncredited)

Max von Sydow as Vigo (voice) (uncredited)

Chloe Webb as Elaine (uncredited)

Justin Michael Woods as Baby on the Street (uncredited)