John Casimir may refer to:
- John Casimir (clarinetist) (1898–1963)
- John Casimir of the Palatinate-Simmern (1543–1592), Count Palatine of Lautern from 1576
- John Casimir, Count of Erbach-Breuberg (1584–1627)
- John Casimir, Count Palatine of Kleeburg (1589–1652), father of Karl X Gustav of Sweden
- John Casimir, Duke of Saxe-Coburg (1564–1633)
- John Casimir, Prince of Anhalt-Dessau (1596–1660), German prince of the House of Ascania
- John Casimir of Poland (1609–1672)
This disambiguation page lists articles about people with the same name.
If an internal link led you here, you may wish to change the link to point directly to the intended article.
If an internal link led you here, you may wish to change the link to point directly to the intended article.