Saint John or St. John usually refers to either John the Baptist or John the Apostle.
Saint John or St. John may also refer to:
Saints
- Ordered chronologically.
- John the Baptist (0s BC–30s AD), preacher, ascetic, and baptizer of Jesus Christ
- John the Evangelist (c. 15–100), presumed author of the Fourth Gospel, traditionally identified with John the Apostle
- John of Patmos, author of the Book of Revelation, traditionally identified with John the Apostle and the Evangelist
- John the Wonderworking Unmercenary (d. c. 304), Egyptian or Mesopotamian healer
- John Chrysostom (c. 340–407), Antiochene Archbishop of Constantinople
- John Cassian (360–435), probably Scythia-Minor priest and abbot
- John and Paul (died 362), Roman martyrs
- John of Egypt (died 394), Egyptian hermit
- John the Silent (452–558), Bishop of Taxara
- Pope John I (470–526), Italian pope
- John of Ephesus (507–586), Syrian ecclesiastical historian
- John Climacus (579–649), Syrian or Byzantine monk and abbot
- John Scholasticus (died 577), 32nd Patriarch of Constantinople
- Patriarch John IV of Constantinople (d. 595), also known as John the Faster, first Ecumenical Patriarch
- John the Merciful (died c. 610), Cyprian Patriarch of Alexandria
- John I Agnus (‘the Lamb’, 7th century), 25th bishop of Tongres
- John III of the Sedre (died 648), Syriac Orthodox Patriarch of Antioch
- John of Damascus (676–749), Syrian monk and priest, also known as John Damascene
- John of Beverley (died 721), Angle bishop
- John of Pavia (died 813), Bishop of Pavia
- John of Rila (876–946), Bulgarian priest and hermit
- John Gualbert (died 1073), Founder of the Vallumbrosan Order
- John Theristus (1049–1129), Italian Benedictine monk
- John of Pulsano (1070–1139), or Giovanni di Matera, Italian abbot
- John of Tufara (1084–1170), Italian monastery founder
- John of the Grating (1098–1168), Bishop of Aleth
- John of Matha (1160–1213), French priest; founder of the Trinitarian Order
- John of Meda (1100–1159), Italian priest
- John Kukuzelis (1280–1360), Byzantine Orthodox Christian composer, singer and reformer
- John of Nepomuk (1340–1393), Bohemian vicar general of Jan of Jenštejn
- John of Capistrano (1386–1456), Italian friar, summoner of European troops for the 1456 siege of Belgrade
- John Cantius (1390–1473), Polish priest and theologian
- John of Sahagún (1419–1479), Spanish priest
- John Fisher (c. 1460–1535), English cardinal and martyr
- Juan Diego (1474–1548), first Native-American saint
- John Houghton (martyr) (1486–1535), English abbot and martyr (one of the Forty Martyrs of England and Wales)
- John Stone (martyr) (died 1539), English friar and martyr (one of the Forty Martyrs of England and Wales)
- John of God (1495–1550), Portuguese friar; founder of the Brothers Hospitallers of St. John of God
- John of Ávila (1500–1569), Spanish Jewish converso priest, missionary and mystic
- John Payne (martyr) (1532–1582), English priest and martyr (one of the Forty Martyrs of England and Wales)
- John de Ribera (1532–1611), or Juan de Ribera, Bishop of Valencia
- John Leonardi (1541–1609), Italian priest; founder of the Clerks Regular of the Mother of God of Lucca
- John of the Cross (1542–1591), Spanish Jewish converso friar, priest and mystic; joint founder of the Discalced Carmelites
- John Boste (1544–1594), English priest and martyr (one of the Forty Martyrs of England and Wales)
- John Rigby (martyr) (died 1600), English martyr (one of the Forty Martyrs of England and Wales)
- John Roberts (martyr) (c. 1570–1610), Welsh priest, Prior of Saint Gregory'sone of the Forty Martyrs of England and Wales
- John Sarkander (1576–1620), Polish priest and martyr
- John Ogilvie (saint) (1579–1615), Scottish priest and martyr
- John Jones (martyr) (died 1598), Welsh priest and martyr (one of the Forty Martyrs of England and Wales)
- John Macias (1585–1645), Spanish missionary
- John Southworth (martyr) (1592–1654), English priest and martyr (one of the Forty Martyrs of England and Wales)
- Jean de Brébeuf (1593–1649), French missionary and martyr (one of the North American Martyrs)
- John Francis Regis (1597–1640), French priest
- Jean de Lalande (died 1646), French missionary and martyr (one of the North American Martyrs)
- John Berchmans (1599–1621), Flemish seminarian
- John Kemble (martyr) (1599–1679), English priest and martyr (one of the Forty Martyrs of England and Wales)
- John Eudes (1601–1680), or Jean Eudes, French priest and founder of the Congregation of Jesus and Mary
- John Wall (priest and martyr) (1620–1679), English priest and martyr (one of the Forty Martyrs of England and Wales)
- John Plessington (c. 1630–1679), English priest and martyrone of the Forty Martyrs of England and Wales
- Saint John Lloyd (died 1679), Welsh priest and martyr (one of the Forty Martyrs of England and Wales)
- John de Britto (1647–1693), Portuguese missionary and martyr
- John of Tobolsk (1651–1715), Metropolitan of Tobolsk
- Jean-Baptiste de La Salle (1651–1719), French priest; founder of the Institute of the Brothers of the Christian Schools
- John Joseph of the Cross (1654–1739), Ischian friar, priest and Vicar Provincial of the Alcantarine Reform in Italy
- John Dat (c. 1765–1798), Vietnamese priest and martyr
- Jean Vianney (1786–1859), French priest
- John Hoan Trinh Doan (c. 1789/1798–1861), Vietnamese priest and martyr
- John Thanh Van Dinh (1796–1840), Vietnamese martyr
- John Baptist Y (1800–1839), one of the Korean Martyrs
- John Henry Newman (1801–1890), English Oratorian priest, convert from Anglicanism
- John Gabriel Perboyre (1802–1840), or Jean-Gabriel Perboyre, French missionary and martyr
- John Baptist Con (1805–1840), Vietnamese martyr
- John Charles Cornay (1809–1837), or Jean-Charles Cornay, French missionary and martyr
- John Neumann (1811–1860), Bohemian missionary, Bishop of Philadelphia, founder of the first American Catholic diocesan school system
- John Bosco (1815–1888), Italian priest and educator; founder of the Salesians of Don Bosco and the Salesian Cooperators
- John of Kronstadt (1829–1909), Russian archpriest and synod member
- John of Shanghai and San Francisco (1896–1966), also known as John the Wonderworker, Archbishop of Shanghai and San Francisco
- Pope John XXIII (1881–1963), Italian pope from 1958 to 1963
- Pope John Paul II (1920–2005), Polish pope from 1978 to 2005
Others
- St John (name), a list of people and fictional characters with the given name or surname
United States and territories
- Saints John, Colorado, also known as Saint John, a former mining town
- St. John, Florida
- St. John, Indiana
- Saint John, Warrick County, Indiana
- St. John, Kansas
- Saint John, Kentucky
- Saint John Plantation, Maine
- Saint John River (Bay of Fundy), from northern Maine into Canada
- St. John, Missouri
- St. John, Pulaski County, Missouri
- St. John, North Dakota
- St. John, Utah, Rush Valley, Utah
- Saint John, Austin, Texas, a neighborhood
- St. John, Washington
- St. John, Wisconsin
- Saint John, U.S. Virgin Islands, an island in the Caribbean Sea
- Saint John, Saint Croix, U.S. Virgin Islands, a small town on Saint Croix
- St. John Township (disambiguation)