Barrowby is a village and civil parish in the South Kesteven district of Lincolnshire, England. It is 2 miles (3.2 km) west of Grantham town centre in a position overlooking the Vale of Belvoir. It has a Grade I listed parish church. The hamlet of Casthorpe is part of the parish. The 2001 Census listed 795 households and a population of 1,996, which fell to 840 households with 1,952 inhabitants at the 2011 census.