Fort St. John may refer to:
Fort St. John, British Columbia, a city in British Columbia, Canada Spanish Fort (New Orleans), also known as Fort St. John, a historic place in New Orleans, Louisiana, United States Fort St. John Group, a stratigraphical unit of the Western Canadian Sedimentary Basin
See also Fort Saint-Jean (disambiguation) Fort San Juan (disambiguation) Forte de São João (disambiguation) Port St. John, Florida