John Neville as Hieronymus Karl Frederick Baron von Munchausen

Eric Idle as Desmond / Berthold

Sarah Polley as Sally Salt

Oliver Reed as Vulcan

Charles McKeown as Rupert / Adolphus

Winston Dennis as Bill / Albrecht

Jack Purvis as Jeremy / Gustavus

Valentina Cortese as Queen Ariadne / Violet

Jonathan Pryce as The Right Ordinary Horatio Jackson

Bill Paterson as Henry Salt

Peter Jeffrey as Sultan

Uma Thurman as Venus / Rose

Alison Steadman as Daisy

Ray Cooper as Functionary

Don Henderson as Commander

Robin Williams as King of the Moon

Sting as Heroic Officer

Andrew MacLachlan as Colonel

José Lifante as Dr. Death

Mohamed Badrsalem as Executioner

Kiran Shah as Executioner's Assistant

Franco Adducci as Treasurer

Ettore Martini as First General

Antonio Pistillo as Second General

Michael Polley as Gunner

Tony Smart as Gunner

Laura D'Arista Adam as Theatergoer (uncredited)

Calogero Azzaretto as Pirate (uncredited)

Angelo Casadei as Citizen (uncredited)

Martin Dansky as German Noble (uncredited)

Terry Gilliam as Irritating Singer Inside Fish (uncredited)

Alba Maiolini as Citizen (uncredited)

Franca Scagnetti as Citizen (uncredited)

Luciano Zanussi as Citizen (uncredited)