Bill Murray (Peter Venkman)
Dan Aykroyd (Raymond Stantz)
Sigourney Weaver (Dana Barrett)
Harold Ramis (Egon Spengler)
Ernie Hudson (Winston Zeddmore)
Rick Moranis (Louis Tully/The Key Master)
Annie Potts (Janine Melnitz)
Carol Henry (Reporter)
Ruth Oliver (Library Ghost)
James Hardie (Reporter)
Danny Stone (Coachman)
Jennifer Runyon (Jennifer)
Murray Rubin (Man at Elevator)
John Rothman (Library Administrator)
Sam Moses (Hot Dog Vendor)
Frances E. Nealy (Chambermaid)
Frantz Turner (Reporter)
Larry Dilg (Con Edison Man)
Winston May (Businessman Vendor)
Christopher Wynkoop (TV Reporter)
Bill Couch (Stunt Coordinator)
Nancy Kelly (Reporter)
Paddi Edwards (Gozer (uncredited))
John Ring (Fire Commissioner)
Jason Reitman (Birthday party kid)
Eda Reiss Merin (Louis' Neighbor)
Kymberly Herrin (Dream Ghost)
Stanley Grover (Reporter)
Roger Grimsby (Himself)
Rhoda Gemignani (Real Estate Woman)
Joe Franklin (Himself)
Patty Dworkin (Woman at Party)
Joe Cirillo (Police Captain)
Jordan Charney (Dean Yeager)
Timothy Carhart (Violinist)
Tommy Hollis (Mayor's Aide)
Reginald VelJohnson (Jail Guard)
Casey Kasem (Himself)
Jean Kasem (Tall Woman at Party)
Larry King (Himself)
Tom McDermott (Archbishop)
Ric Mancini (Cop at Apartment)
Norman Matlock (Fire Commissioner)
Steven Tash (Student)
Slavitza Jovan (Gozer)
Michael Ensign (Hotel Manager)
Alice Drummond (Librarian)
William Atherton (Walter Peck)
David Margulies (Mayor)