Cambridgeshire Constabulary is the local territorial police force that covers the county of Cambridgeshire and Peterborough unitary authority. It provides law enforcement and security for an area of 1,311 square miles (3,400 km2) and population of 856,000 people, in a predominantly rural county. The force of Cambridgeshire includes the cities of Cambridge, Ely and Peterborough, the market towns of Chatteris, Huntingdon, March, Ramsey, St Ives, St Neots, Whittlesey, and town and Port of Wisbech. Its emblem is a crowned Brunswick star containing the heraldic badge of Cambridgeshire County Council.

Cambridgeshire or the County of Cambridge is a ceremonial county and historic county in the East of England and East Anglia. It is bordered by Lincolnshire to the north, Norfolk to the north-east, Suffolk to the east, Essex and Hertfordshire to the south, and Bedfordshire and Northamptonshire to the west. The largest settlement is the city of Peterborough, and the city of Cambridge is the county town.