North Hertfordshire is one of ten local government districts in the county of Hertfordshire, England. Its council is based in Letchworth Garden City and the largest town is Hitchin. The district also includes the towns of Baldock and Royston and numerous villages and surrounding rural areas. Part of the district lies within the Chiltern Hills, a designated Area of Outstanding Natural Beauty.

Letchworth Garden City, commonly known as Letchworth, is a town in the North Hertfordshire district of Hertfordshire, England. It is noted for being the first garden city. The population at the time of the 2021 census was 33,990.