John may refer to any of the following saints:
- Apostle John the Evangelist and Theologian
- John the Forerunner (January 7)
- John Chrysostom
- John Climacus
- John of Damascus
- John Calabytes, Gr. Καλυβίτης, "the Hut-dweller", (January 15);
- John the Martyr (January 22);
- John (January 26);
- John the Unmercenary (January 31), see also St. Cyrus.
- John the New-Martyr (February 3);
- John, Bishop of Irinoupolis (February 4);
- John (A) (February 6);
- John (B) (February 6);
- John of Thessaloniki, the New-Martyr (February 15);
- John Scholasticus, Patriarch of Constantinople (February 21)
- John (February 23);
- John the "Kalfas", Gr. ο Κάλφας (February 26)
- John (Beverley) of England (March 7)
- John the Silent, Bishop of Colonia (March 30), also known as Hesychastes
- John the "Koulikas", Gr. ο Κουλικάς, New-Martyr (April 8);
- John the "Nafkliros", Gr. Ναύκληρος (April 8);
- John the Virgin-Martyr (April 12);
- John of Vilna (April 14), Russian
- John the Martyr (April 14);
- John of Ioannina, New-Martyr (April 18);
- John the Old-Lavritis, Gr. ο Παλαιολαυρίτης (April 20);
- John of Serbia (April 26);
- John the Confessor, Gr. ο Ομολογητής (April 27);
- John, Metropolitan of Thebes, Gr. Θηβών ([[April 29]
- John the New of Suceava (June 2 and June 24)
- John martyr of the Boxer-Rising, see Metrophanes Chi Sung (June 11);
- John the Soldier of Egypt (June 12);
- John, Bishop of Zihnon, Gr. Ζιχνών, (December 12), also known as Ioachim;
- John Θ', Patriarch of Constantinople (July 18);
- John the Russian Fool-for-Christ (July 3);
- John, Metropolitan of Chalcedon (July 18);
- John of Kiev, the long suffering (Russian) (July 18);
- John (July 21);
- John the Martyr (July 29);
- John the Soldier (July 29)
- John, Bishop of Ephesus (August 3);
- John, Bishop of Ephesus, the New (August 3);
- John the Confessor, Gr. ο Ομολογητής (August 3);
- John the Martyr (August 9);
- John, Patriarch of Constantinople (August 18);
- John the Karpathios, Gr. ο Καρπάθιος (August 25);
- John, Archbishop of Constantinople (August 25);
- John the Martyr (August 26);
- John, Patriarch of Constantinople (August 30)
- John the Faster, Patriarch of Constantinople (September 2)
- John the Hairy (September 3)
- John of Crete, the New-martyr (September 15)
- John the Confessor of Egypt (September 20), beheaded in Palestine, and with him 40 martyrs
- John the God-bearer, Gr. Θεοφόρος (September 20)
- John the Virgin Martyr (September 22)
- John the Chanter (October 1)
- John of Rila the Miracle-worker (October 19)
- John the Merciful (November 12)
- John the Hermit (December 2);
- John, Bishop of Kolonias, Gr. Κολωνίας, (December 3);
- John, Bishop of Polivotou, Gr. Πολυβότου (December 4);
- John the Faster (Russian) (December 7);
- John of Kronstadt (December 20), Russian
- John the ράφτης, New-Martyr (December 20)
- John of Athens, (4th ... Gr. 4η Διακαινησίμου)
- John the Virgin Martyr, (4th ... Gr. 4η Διακαινησίμου) and January 14)
- John the Kilikianos, Gr. ο Κιλικιανός (4th ... Gr. 4η Διακαινησίμου)
- John the Sabbaitis, Gr. ο Σαββαΐτης (4th ... Gr. 4η Διακαινησίμου)
John may also refer to any of the following Scriptural books: