Richard Dreyfuss as Hooper
Lorraine Gary as Ellen Brody
Murray Hamilton as Vaughn
Jeffrey Kramer as Hendricks (as Jeffrey C. Kramer)
Susan Backlinie as Chrissie
Jonathan Filley as Cassidy
Ted Grossman as Estuary Victim
Chris Rebello as Michael Brody
Lee Fierro as Mrs. Kintner
Jeffrey Voorhees as Alex Kintner
Craig Kingsbury as Ben Gardner
Robert Nevin as Medical Examiner (as Dr. Robert Nevin)
Peter Benchley as Interviewer
Tim Aguirre as Infant on Beach
Chris Anastasio as Out of Towner
John Bahr as Beach Guitarist
Edwin C. Carlson as Man with Goff
Robert Carroll as Mr. Polk
Edward Chalmers Jr. as Mr. Denherder
Robert Chambers as Charlie
Fritzi Jane Courtney as Mrs. Taft
David Daniel as Hippie on Beach
Gregory S. Dole as Sonar Operator
Cyprian R. Dube as Mr. Posner
Stephen Earle as Converted Man
Robin Eddins as Screaming Swimmer
David Engelbach as Research Assistant
Dorothy Fielding as Girl in Music Store
Francis A. Frank as Boat Rental Man
Brendan Gallagher as Man with Dynamite
Elizabeth K. Gifford as Island Wife
Alston Goff as Lynwood Shop Keeper
Paul Goulart as Clarinet Player in Music Store
Beardsley Graham as Mainlander
Eleanor L. Harvey as Motorboat Skipper
Mike Haydn as Bonfire Guitarist
Richard P. Hewitt as Walter
Wally Hooper Jr. as Harry
Janice T. Hull as Lady Fisherman
Stephanie Hull as Swimming Girl
Duncan Inches as Townsperson
Joseph G. Kraetzer as Local Merchant
Belle McDonald as Mrs. Posner
John Moffet as Man at Bonfire with Mustache
Philip Norton as Mr. Stands
William O'Gorman as Man with Dynamite
Joseph Oliveira as Swimmer
Dennett Paula as Woman at Beach
William Pfluger as Sailboat Skipper
Donald Poole as Frank Silva - Harbor Master
Steven Potter as Man with Dog
Beverly Powers as Topless Swimmer
Christopher Sands as Lifeguard
Henry E. Scott III as Man with Rifle
John Searle as Converted Man
Steven Spielberg as Amity Point Lifestation Worker (Voice)
Joy Stuart as Woman Tourist #1
Jerome S. Tartar as Boat Captain
Paul G. Thibodeau as Fisherman in Boat
Rex Trailer as Scout Master
Paul F. Tremblay as Deputy #2
Hershel West as Salvatore
Robert Whelden Jr. as Policeman
Alfred Wilde as Harry Wiseman