Lana Turner as Diane de Poitiers - Countess de Breze

Pedro Armendáriz as King Francis I

Roger Moore as Prince Henri

Marisa Pavan as Catherine de Medici

Cedric Hardwicke as Ruggieri

Torin Thatcher as Louis - Count de Breze

Taina Elg as Alys

John Lupton as Regnault

Henry Daniell as Gondi

Ronald Green as The Dauphin

Sean McClory as Count Michel Montgomery

Geoffrey Toone as Duke of Savoy

Michael Ansara as Count Ridolfi

Paul Cavanagh as Lord Bonnivet

Melville Cooper as 1st Court Physician

Ian Wolfe as Lord Tremouille

Basil Ruysdael as Chamberlain

Christopher Dark as Giancarlo

Marc Cavell as Piero

Gene Reynolds as Montecuculli

John O'Malley as Marechal de Chabannes

Peter Gray as Sardini

Mickey Maga as Charles

Ronald Anton as Francis

Ann Brendon as Lady in Waiting (uncredited)

Peter Brocco as Court Painter (uncredited)

Wes Christensen as Guard (uncredited)

Bunny Cooper as Lady in Waiting (uncredited)

Barbara Darrow as Lady in Waiting (uncredited)

Leslie Denison as Chief Huntsman (uncredited)

Robert Dix as Young Officer (uncredited)

James Drury as Lieutenant (uncredited)

James Fairfax as Suitor (uncredited)

Jamie Farr as Count Ridolfi's Mute Squire (uncredited)

Pat Ferguson as Groom (uncredited)

Duane Grey as Captain of the Guard (uncredited)

Peter Hansen as 2nd Court Physician (uncredited)

Peter Hansen as Messenger (uncredited)

Percy Helton as Court Jester (uncredited)

David Hoffman as Court Painter (uncredited)

Alicia Ibanez as Lady in Waiting (uncredited)

John Irving as Gentleman (uncredited)

Charles Keane as Captain (uncredited)

Paul Kent as Groom (uncredited)

Alan Lee as Worshipper (uncredited)

James Logan as Suitor (uncredited)

Britt Lomond as Guard (uncredited)

Tyler MacDuff as Montgomery's Squire (uncredited)

Anthony Marsh as Gentleman (uncredited)

Jerry Martin as Barber (uncredited)

Fay Morley as Lady in Waiting (uncredited)

Leonard Mudie as Porter (uncredited)

Vesey O'Davoren as Valet (uncredited)

Milton Parsons as Suitor (uncredited)

Paul Préboist as Extra (uncredited)

Ann Staunton as Lady in Waiting (uncredited)

Stuart Whitman as Henri's Squire (uncredited)