The Church of St John the Baptist, Barnack is a Church of England parish church in the village of Barnack, now in the City of Peterborough unitary authority area of the ceremonial county of Cambridgeshire, England. Barnack was part of the Soke of Peterborough, an historic area that was traditionally part of Northamptonshire. Barnack is 3.5 miles (6 km) south-east of Stamford in Lincolnshire. The church is a Grade I listed building.