Hertfordshire Constabulary is the territorial police force responsible for policing the county of Hertfordshire in England. Its headquarters is in Welwyn Garden City. The current chief constable is Charlie Hall. As of March 2019, the force consists of over 1,900 police officers, 235 PCSOs, over 1500 police staff, as well as being supported by more than 410 special constables.

Welwyn Garden City is a town in Hertfordshire, England, 20 miles (32 km) north of London. It was the second garden city in England and one of the first new towns. It is unique in being both a garden city and a new town and exemplifies the physical, social and cultural planning ideals of the periods in which it was built.