Gilston is a village in the East Hertfordshire District of Hertfordshire, England. It is located a little over one mile north of the town of Harlow in the neighbouring county of Essex. Together with the nearby hamlet of Eastwick, it forms the post-1974 civil parish of Eastwick and Gilston. At the 2001 Census, the population of this parish was 180.
The name derives from "Gedel" or "Gydel", an Old English personal name, and "tun", meaning farm or settlement.
The Parish Church of St Mary dates from the 13th century, and is Grade I listed.