Oldcastle may refer to:
Places
- Oldcastle, Bridgend, Wales, a ward
- Oldcastle, Cheshire, England, a parish
- Oldcastle, County Meath, Ireland, a town
- Oldcastle, Monmouthshire, Wales, a village
- Oldcastle, Ontario, Canada, an unincorporated community
People with the surname
- Sir John Oldcastle, a supporter of the Lollards in the 15th century
- Sir John Oldcastle, a play about him
Other uses
- Oldcastle Revolt, a revolt led by John Oldcastle
See also
- Old Castle (disambiguation)