John Sigismund may refer to: John Sigismund, Elector of Brandenburg (1572–1619) John Sigismund Tanner (1705–1775), chief engraver at the Royal Mint of Great Britain John Sigismund Vasa (1652), Polish prince who died shortly after birth John Sigismund Zápolya (1540–1571), King of Hungary and Prince of Transylvania
Johann Sigismund may refer to: Johann Sigismund Elsholtz (1623–1688), German naturalist Johann Sigismund Kusser (1660–1727), German-born composer Johann Sigismund Riesch (1750–1821), Austrian military officer Johann Sigismund Scholze (1705–1750), Silesian music anthologist and poet