Ros Hill, also known as Ros Castle due to the 3,000-year-old Iron Age hill fort on its summit, is a hill in the county of Northumberland in northern England. It is the highest point of a low range of hills stretching from Alnwick to Berwick-upon-Tweed - the Chillingham Hills. Other tops of the Chillingham Hills include Titlington Pike, Dod Law and Doddington Northmoor.