John X (disambiguation)

John X may refer to:


 * Pope John X (r. 914–928)
 * John X (archbishop of Ravenna) (r. 983–998)
 * John X bar Shushan (r. 1063/1064–1072/1073)
 * Pope John X of Alexandria (r. 1363–1369)
 * John X of Antioch (Greek Orthodox, r. 2013–present)
 * John X of Schleswig-Holstein-Gottorp