John IX

John IX may refer to:


 * Pope John IX (died 900)
 * John IX bar Shushan (died 1073), Syriac Orthodox Patriarch of Antioch
 * John IX of Constantinople, Patriarch of Constantinople, 1111–1134
 * John IX of Haugwitz, 1524–1595
 * John IX, Count of Oldenburg, 1272–c. 1301
 * John IX of Salm-Kyrburg-Mörchingen, 1575–1623