John Casimir may refer to:
- John II Casimir of Poland (1609–1672)
- Johann Casimir of Simmern (1543–1592)
- John Casimir, Duke of Saxe-Coburg (1564–1633)
- John Casimir (clarinetist) (1898–1963)
- John Casimir, Count Palatine of Kleeburg (1589–1652), father of Karl X Gustav of Sweden
- John Casimir Ehrnrooth, Finnish soldier
- John Casimir Zichy Woinarski, Australian ornithologist
Famous quotes containing the word john:
“Perfect soldier, perfect gentleman ... never gave offence to anyone, not even the enemy.”
—A.J.P. (Alan John Percivale)