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
See also
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