People
Several Saints:
John the Apostle, one of the 12 apostles of Jesus John the Evangelist, traditionally identified with a apostle, to whom a Gospel of John is attributed, often along by having 1 John, 2 John, 3 John, and Revelation. Saint John the Baptist Saint John Chrysostom (347-407), Archbishop of Constantinople Saint John of Capistrano (1386-1456) (Also referred to as Giovanni district attorney Capistrano) Saint John Cassian (c. 360-433) Saint John We, Pope John I (523-526) Saint John of Ephesus (c. 505 - c. 585) Saint John Climacus (c. 579-649), as well referred to as John of the Ladder, John Scholasticus & John Sinaites Saint John of Damascus (c. 676-749), venerable Father of the Church Saint John of Beverley (d. 721) inside Beverley, England. Saint John of Nepomuk (c. 1340-1396) Saint John Fisher (1469-1535), Bishop of Rochester, professor at Cambridge Saint John of God (1495-1550) Saint John of Avila (1500-1569) Saint John of the Cross (1542-1591), Spanish mystic Saint John Sarkander (1576-1620), Moravian priest Saint John Baptist de la Salle (1651-1719), the patron saint of teachers (as well known by his French title, Jean-Baptiste delaware la Salle) Saint John Neumann (1811-1860), Bishop of Philadelphia Saint John Bosco or even Giovanni Melchior Bosco (1815-1888)

Other people
Ian St. John, the footballer John St. John Oliver St. John Austin St John Bridget St. John Henry St John, 1st Viscount Bolingbroke Kate St. John

Institutions
St John Ambulance

Several Church of England Schools:
St John's Church of England School, London St John's School, Billericay

Places
Place names (including spellings Saint Johns and '''Saint John's''')
Canada
Saint John in Saint John County, New Brunswick Saint John (electoral district) federal electoral district inside Canada. St. John's, Newfoundland and Labrador St. Johns & Fort St-Jean, previous title of Saint-Jean-sur-Richelieu, Quebec St. Johns riding, a riding in North Winnipeg. St. John River, eastern North America

United States
St. John, Indiana St. John, Kansas St. John, Maine St. John, Missouri St. John, North Dakota St. John, Washington St. Johns, Arizona St. Johns County, Florida St. Johns River, Florida St. Johns, Michigan St. Johns, Illinois Saint John, United States Virgin Islands

United Kingdom
St. John's, South Yorkshire, England St. John's, London, England St John's Wood, London, England St. John's, Isle of Man

Other countries
St. John's, Antigua and Barbuda Saint John's Island, Singapore

Other possible meanings:
Order of Knights of the Hospital of St. John of Jerusalem or Knights Hospitaller, named after Saint John of Jerusalem aka John the Baptist Order of St. John, a 19th century revival of the Knights Hospitaller Prester John, a legendary Christian ruler around Asia and/or Africa