Thornhaugh is a civil parish and village in the city of Peterborough, Cambridgeshire in the United Kingdom. For electoral purposes it forms part of Glinton and Wittering ward in North West Cambridgeshire constituency. St Andrew's Church dates from the 12th century, although was much restored in the 19th century. Although the main village is close to the A1, there is a significant hamlet (Home Farm, Leicester Road, Thornhaugh) with a dozen houses about one mile west of the main village just off the A47, consisting of an old Hunting Lodge (now 2 houses) and associated farm buildings (all now residential). The village sign commemorates the first Baron Russell of Thornhaugh.