Baldock is a historic market town in the North Hertfordshire district of Hertfordshire, England. The River Ivel rises from springs in the town. It lies 33 miles (53 km) north of London and 14 miles (23 km) north northwest of the county town of Hertford. Nearby towns include Royston to the northeast, Letchworth and Hitchin to the southwest and Stevenage to the south.

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.