Ralph Bellamy

Walter Preston

Martin Balsam

Francis Toohey

Steve McQueen

Joseph Gordon

Vivian Nathan

Mrs. Gordon

William Shatner

Kenneth Preston

Ian Wolfe

Judge Marsala

David J. Stewart

Dr. Victor Wallach

Russell Hardie

First Guard

Iggie Wolfington

Court Clerk

Arthur Storch

Seymour Miller

Frank Marth

First Reporter

Eileen Ryan

Betsy Fuller

Milton Selzer

2nd Guard

Rudy Bond

Peter D'Agostino

Dolores Sutton

Norma Lane

Rosetta LeNoire

Mary Ellen Bailey

John McGovern

Dr. Horace Bell

Michael Higgs

Sergeant James Sheeley

Betty Furness

Self / Commercial Spokeswoman

Irene Kane

Courtroom Observer

Florence Stanley

Courtroom Spectator

Ed Asner

Juror (uncredited)

Joby Baker

Trial Spectator (uncredited)

Robert Morris

Anthony Carmonada (uncredited)