Saint John may refer to:
- the Gospel according to St. John;
- Saints:
- John the Apostle, to whom the Gospel of John is attributed
- John the Evangelist, traditionally identified with the apostle, and to whom the books 1 John, 2 John, 3 John, and Revelation are attributed
- Saint John the Baptist
- Saint John of Damascus, translator of an account of Buddha's life in to Greek;
- Place names:
- Saint John, New Brunswick in Saint John County, New Brunswick
- St. John, Indiana
- St. John, Kansas
- St. John, Maine
- St. John, Missouri
- St. John, North Dakota
- St. John, Washington
- Saint John, United States Virgin Islands.
- Saint John River, eastern North America
- St. John's or Saint John's
- St. Johns or Saint Johns
- Saint Johns, Arizona, United States
- Saint Johns County, Florida
- Saint Johns, Michigan
- Saint Johns, Illinois
- Saint-Jean-sur-Richelieu, Quebec, Canada (formerly St. Johns and Fort St-Jean)
- The Order_of_St._John
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