King John's Castle may refer to:
- King John's Castle (Limerick), Limerick City, Ireland
- King John's Castle (Carlingford), County Louth, Ireland
- King John's Castle (Kilmallock), County Limerick, Ireland
- King John's Castle in Kineton, Warwickshire, United Kingdom
- King John's Castle, a horse that finished second in the 2008 Grand National
See also
edit- Athenry, County Galway
- Naas, County Kildare
- Odiham Castle near Odiham, Hampshire
- Trim Castle, County Meath
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