Greencastle

Greencastle or Green Castle may refer to:

Germany

 * Green Castle (Grünes Schloss), Weimar; see Duchess Anna Amalia Library

Ireland

 * Greencastle, County Donegal, Republic of Ireland
 * Greencastle, County Down, Northern Ireland
 * Greencastle, County Tyrone, Northern Ireland

Scotland

 * Green Castle, Portknockie, an Iron Age and Pictish promontory fort

United States

 * Greencastle, Indiana, a city
 * Greencastle, Missouri, a city
 * Greencastle, Pennsylvania, a borough
 * Greencastle, West Virginia, an unincorporated community
 * Greencastle, Kanawha County, West Virginia, an unincorporated community

Other uses

 * Greencastle (film)