Stewart Granger as Rudolf Rassendyll / King Rudolf V

Deborah Kerr as Princess Flavia

James Mason as Rupert of Hentzau

Louis Calhern as Col. Zapt

Jane Greer as Antoinette de Mauban

Lewis Stone as The Cardinal

Robert Douglas as Michael, Duke of Strelsau

Robert Coote as Fritz von Tarlenheim

Peter Brocco as Johann

Francis Pierlot as Josef

Jay Adler as

Kathleen Freeman as

John Goldsworthy as

Thomas Browne Henry as

Doris Lloyd as

Stanley Logan as

Stephen Roberts as

Bud Wolfe as