The Pyramid of the Sun God is a 1965 West German and Italian western film adventure directed by Robert Siodmak and starring Lex Barker, Gérard Barray and Michèle Girardon. It is based on a book by Karl May, and was part of a boom of Karl May adaptations during the decade. It follows on from The Treasure of the Aztecs (1965), also directed by Siodmak and featuring substantially the same cast.