Three Castles was a medieval lordship in Monmouthshire, Wales, comprising the fortifications of Grosmont, Skenfrith and White Castle.

Three Castles or Threecastles may also refer to:

• Three Castles of Bellinzona, Ticino, Switzerland (namely Castelgrande, Montebello and Sasso Corbaro)
• Three castles of Husseren-les-Châteaux or Eguisheim, Haut-Rhin, Vosges, France (namely the Dagsburg, the Wahlenburg and Weckmund Castle)
• Three castles at Dahn, Rhineland-Palatinate, Germany (namely Altdahn, Grafendahn, Tanstein)
• Threecastles Castle, Blessington, County Wicklow, Ireland.
• Threecastles, County Kilkenny, village in Ireland
• Three Castles Walk (disambiguation), various long-distance footpaths in Britain

• Castle Three, British cycle car made 1919–1922

This disambiguation page lists articles associated with the title Three Castles.
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