Watch Hill Castle (also known as Yarwood Castle, Castle Hill, and Bowdon Watch) is an early medieval motte-and-bailey on the border of Bowdon and Dunham Massey, England. It is a Scheduled Ancient Monument. As the only Scheduled Ancient Monument in Trafford, it is arguably the most important archaeological site in the borough. The castle is located north of the River Bollin and south of a deep ravine ().