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Monmouth Castle is a castle in the town of Monmouth, county town of Monmouthshire, south east Wales. It is a Grade I listed building and scheduled monument.
Monmouth Castle is located close to the centre of Monmouth on a hill towering over the River Monnow, behind shops and the main square and streets. Once an important border castle, and birthplace of Henry V of England, it stood until the English Civil War when it was damaged and changed hands three times before being slighted to prevent it being fortified again. After partial collapse in 1647, the site was reused and built over by Great Castle House, which became the headquarters and regimental museum of the Royal Monmouthshire Royal Engineers.