Oldcastle
English
Proper noun
Oldcastle
- A town in County Meath, Ireland.
- A former civil parish in Cheshire West and Chester borough, Cheshire, England, abolished in 2015; the hamlet of Oldcastle Heath is in this area (OS grid ref SJ4745).
- An area and ward in Bridgend county borough, Wales (OS grid ref SS9079).
- A small village in Monmouthshire, Wales, near the border with England (OS grid ref ST3224).
- An unincorporatedcommunity in Tecumseh, Ontario, Canada.