Charly

Cliff Robertson

Charlie Gordon

Claire Bloom

Alice Kinian

Lilia Skala

Dr. Anna Straus

Leon Janney

Dr. Richard Nemur

Ruth White

Mrs. Apple

Dick Van Patten

Bert

Edward McNally

Gimpy

Barney Martin

Hank

William Dwyer

Joey

Dan Morgan

Paddy

Marianna Case

Young Woman (uncredited)

Leon Collins

Tap Dancer (uncredited)

Harry Cooper

Conference Attendee (uncredited)

Frank Dolan

Eddie (uncredited)

Randee Lynne Jensen

Woman (uncredited)

Ralph Nelson

Convention Speaker (uncredited)

Donald Warnock

Conference Attendee (uncredited)