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 Pope John IX of Alexandria
See also Johann IX Philipp von Walderdorff John 9, the ninth chapter of the Gospel of John