Belton and Manthorpe is a civil parish in the South Kesteven district of Lincolnshire, England, consisting of Belton and Manthorpe, just north of Grantham. According to the 2001 census it had a population of 517 in 192 households. By 2011 the authorities recorded 528 people in 216 homes. The parish lies on either side of the River Witham, flowing northwards from Grantham to Lincoln, and is similarly bisected by the A607 road which follows the River closely through the parish.