Saint Johnstown

Saint (or St) Johnstown, Johnstoun, Johnston or Johnstone may refer to:

Ireland

 * St Johnston, County Donegal
 * St Johnstown (County Donegal) (Parliament of Ireland constituency)
 * Saint Johnstown or Ballinalee, County Longford
 * St Johnstown (County Longford) (Parliament of Ireland constituency)

Scotland

 * Perth, Scotland, originally known as Saint John's Toun or St Johnstone
 * St Johnstone F.C., based in Perth

United States

 * Saint Johnstown, Delaware, a stop on the now defunct Queen Anne's Railroad line between Ellendale and Greenwood