Royston is a town and civil parish in the District of North Hertfordshire and county of Hertfordshire in England.

It is situated on the Greenwich Meridian, which brushes the town’s eastern boundary, and at the northernmost apex of the county on the same latitude as towns such as Milton Keynes and Ipswich. It is about 43 miles (69 km) north of central London in a rural area.

Before the boundary changes of the 1890s, the boundary between Hertfordshire and Cambridgeshire ran east–west through the centre of town along the middle of Melbourn Street. The town has a population of 15,781.