"Dortmunder and his pals plan to steal a huge diamond from a museum. But this turns out to be only the first time they have to steal it..."
Robert Redford
as John Dortmunder
George Segal
as Andrew Kelp
Ron Leibman
as Stanley Murch
Paul Sand
as Alan Greenburg
Moses Gunn
as Dr. Amusa
William Redfield
as Lt. Hoover
Topo Swope
as "Sis" Clara Kelp
Charlotte Rae
as Ma Murch
Graham Jarvis
as Frank, the Prison Warden
Christopher Guest
as Policeman
Zero Mostel
as Abe Greenberg
Harry Bellaver
as Rollo the Bartender
Seth Allen
as Happy Hippie
Robert Levine
as Cop At Police Station
Ed Bernard
Lee Wallace
as Dr. Strauss
Robert Weil
as Albert
Lynne Gordon
as Miasmo
Grania O'Malley
as Bird Lady
Fred Cook
as Otto
Mark Dawson
as Big Museum Guard
Gilbert Lewis
as Museum Guard #1
George Bartenieff
as Museum Guard #2
Charles White
Albert Henderson
as Prison Property Clerk (uncredited)
Burt Richards
as Police Officer (uncredited)
Arnold Williams
as Prisoner (uncredited)
John Robert Lloyd
Production Design
Robert Drumheller
Set Decoration
Alixe Gordin
Casting
Peter Yates
Director
Donald E. Westlake
Novel
William Goldman
Screenplay
David Golden
Production Supervisor
Saul Wurtzel
Unit Production Manager
James Sabat
Sound
Theodore Soderberg
Irving Buchman
Makeup Artist
Ted Zachary
Assistant Director
Nicholas Sgarro
Second Unit Director
Ira Anderson Jr.
Special Effects
Carey Loftin
Stunt Coordinator
Hal Landers
Producer
Bobby Roberts
Quincy Jones
Original Music Composer
Edward R. Brown
Director of Photography
Fred W. Berger
Editor
Frank P. Keller
Ruth Morley
Costume Design
Alice H. Bell
Second Assistant Director
John Nicolella
Allan Wertheim
Morris Weinman
Set Dresser
Don Winclair
Sound Recordist
Tony Parmelee
Richard Falk
Gaffer
Peter Garbarini
Camera Operator
Ron Zarilla
Second Assistant Camera