Great Gransden is a civil parish and village in the Huntingdonshire district of Cambridgeshire, England. In 2001, the parish population was 969, which rose to 1,023 at the 2011 Census. It lies 16 miles (25 km) west of Cambridge and 13 miles (21 km) south of Huntingdon. It contains the oldest post mill in England.

Huntingdonshire is a local government district in Cambridgeshire, England, which was historically a county in its own right. It borders Peterborough to the north, Fenland to the north-east, East Cambridgeshire to the east, South Cambridgeshire to the south-east, Central Bedfordshire and Bedford to the south-west, and North Northamptonshire to the west.