John Sigismund
John Sigismund may refer to:
- John Sigismund, Elector of Brandenburg
- John Sigismund Tanner, chief engraver at the Royal Mint of Great Britain
- John Sigismund Vasa, Polish prince who died shortly after birth
- John Sigismund Zápolya, King of Hungary and Prince of Transylvania
- Johann Sigismund Elsholtz, German naturalist
- Johann Sigismund Kusser, German-born composer
- Johann Sigismund Riesch, Austrian military officer
- Johann Sigismund Scholze, Silesian music anthologist and poet