John X.
John X is the name of the following people:
- John X. (Pope) (860–929), Pope of the Catholic Church
- John X. Kamateros († 1206), Orthodox Patriarch of Constantinople (1198–1206)
- John X (Alexandria) , Coptic Patriarch of Alexandria (1363-1369)
- John X. (Patriarch of Antioch) (* 1955), Greek Orthodox Patriarch of Antioch
