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) Norman Matlock Police Commissioner Joe Cirillo Police Captain Reginald VelJohnson Jail Guard Rhoda Gemignani Real Estate Woman Murray Rubin Man at Elevator Bill Walton Bill Walton (uncredited) 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) Norman Matlock Police Commissioner Joe Cirillo Police Captain Reginald VelJohnson Jail Guard Rhoda Gemignani Real Estate Woman Murray Rubin Man at Elevator Jean Kasem Tall Woman at Party Sam Moses Hot Dog Vendor Christopher Wynkoop TV Reporter Tommy Hollis Mayor's Aide Frantz Turner Reporter Kymberly Herrin Dream Ghost John De Bello Patrolman Matthews (uncredited) Paddi Edwards Gozer (voice) (uncredited) Eldo Ray Estes Redheaded Man (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) Joe Medjuck Man at Library (uncredited) Frank Patton III City Hall Cop (uncredited) Bill Walton Bill Walton (uncredited)