Gillingham is a town and civil parish in the Blackmore Vale area of Dorset, England. It lies on the B3095 and B3081 roads in the North Dorset administrative district, approximately south of the A303 trunk road and northwest of Shaftesbury. It is the most northerly town in the county. In the 2011 census the civil parish had a population of 11,756. The neighbouring hamlets of Peacemarsh, Bay and Wyke have become part of Gillingham as it has expanded.