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)