Peter Ustinov
— Socrates
Geraldine Page
— Xantippe
Anthony Quayle
— King Pausanias of Sparta
Christopher Walken
— Lamprocles
Lloyd Bochner
— Critias
Salome Jens
— Theodote
Shepperd Strudwick
— Lycon
Richard Ward
— Satyros
Eric Berry
— Meletos
John Heffernan
— Anytas
Allen Nourse
— Phaedo
David Haviland
— Crassos
House Jameson
— The Magistrate
Lee Vines
— Announcer
Nat Horne
— Satyros' Guard
Frank Griso
— Lysis