Old Warden Castle, also known as Quince Hill, is located in the village of Old Warden, in the county of Bedfordshire, England. It was a motte-and-bailey castle, built in timber. Roman and Celtic remains have also been located at the site. Today, only earthworks remain. These are known locally as Quints or Quince Hill. In 1995 the motte and the adjacent ringwork were classified as a Scheduled Monument.