Eccleston is a civil parish in the Metropolitan Borough of St Helens, Merseyside, England. At the 2011 census, it had a population of 10,433. Within the boundaries of the historic county of Lancashire, the early history of Eccleston is marked by its status as a township, an area much larger than the modern civil parish, extending into what is now St. Helens. Part of the township was united with Parr, Sutton and part of Windle to form the Municipal Borough of St Helens in 1868.