The Municipal Borough of Chorley was a local government district in the administrative county of Lancashire, England, with municipal borough status and coterminate with the town of Chorley.

[4] Although Chorley had been an independent civil parish since 1793, the old-fashioned government by a chief and deputy parish constables, with assistants, continued until 1853, when a Board of Improvement Commissioners was formed.

[5] In 1881, under the Municipal Corporations Act 1835, a charter of incorporation was obtained for the town.

[3] The Municipal Borough of Chorley was governed by a mayor and council of eight aldermen and twenty-four councillors, chosen equally from four wards — North, East, South and West.

It was enlarged by gaining 669 acres (2.7 km2) from parts of the civil parishes of Duxbury, Euxton and Heath Charnock in 1934.