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, Count of Oldenburg, 1272–c. 1301
• John IX of Salm-Kyrburg-Mörchingen, 1575–1623