Blackburn is a town in Lancashire, England. It is the main part of the Blackburn with Darwen borough, which has a population of 140,200. It was a key centre for the textile industry during the Industrial Revolution and is popularly known as the home of Blackburn Rovers Football Club. Blackburn is situated to the north of the West Pennine Moors.

Blackburn is known to fans of The Beatles as the town featured in the song "A Day in the Life". An article in the Daily Mail about a plan to fill potholes in the town caught John Lennon's eye as he was writing the song, giving birth to the lyric: "I read the news today. Oh, boy. 4,000 holes in Blackburn Lancashire". This lends itself to the title of the unofficial fanzine of Blackburn Rovers, which is called "4,000 Holes".

According to the UK Government's 2001 census, Blackburn has a population of 105,085.[1] According to the same statistics, some of which include the small town of Darwen to the south, the town is 77.9% white (national average for England and Wales 91.3%) with significant Indian (10.7%) and Pakistani (8.7%) ethnic minorities.[2] 9.6% of the population was born outside the European Union. In terms of religion, 63.3% of residents are christian (national average 71.7%), 19.4% muslim (national average 3.0%) with 16.6% no religion or not stated. This gives the town the third highest proportion of muslims in England and Wales and the highest outside London.

55.1% of the town are in employment, with 4.1% unemployed and 1.2% long term unemployed. This compares unfavourably with respective national averages of 60.6%, 3.4% and 1.0%. 8.7% of residents are looking after a home and/or family, the fifth highest for any borough in England and Wales. Average houselhold size is 2.54 people, the 9th highest in England and Wales. The town is slightly below the national averages on health indicators. Just over one in five (20.3%) of the population say they have a "limiting long term illness" compares with a national average of 18.2%. Over one in ten (11.1%) describe their general health as "not good" compared with an average of 9.2%.