Darwen was a county constituency in Lancashire, centred on the town of Darwen. It returned one Member of Parliament to the House of Commons of the Parliament of the United Kingdom from 1885 until it was abolished for the 1983 general election.

Darwen is a market town and civil parish in the Blackburn with Darwen borough in Lancashire, England. The residents of the town are known as "Darreners". The A666 road passes through Darwen towards Blackburn to the north, Bolton to the south and Pendlebury where it joins the A6, about 18 miles (29 km) north-west of Manchester. The population of Darwen stood at 28,046 in the 2011 census. The town comprises four wards and has its own town council.