Woolsthorpe by Belvoir, also known as Woolsthorpe is a village and civil parish in the South Kesteven district of Lincolnshire, England. The population of the civil parish at the 2011 census was 415. It is situated approximately 5 miles (8 km) west from Grantham, and adjoins the county border with Leicestershire. The neighbouring village of Belvoir lies on the other side of the border. Grantham Canal is situated 1 mile (1.6 km) to the north-east at its closest point.

South Kesteven is a local government district in Lincolnshire, England, forming part of the traditional Kesteven division of the county. Its council is based in Grantham. The district also includes the towns of Bourne, Market Deeping and Stamford, along with numerous villages and surrounding rural areas.