Rossendale and Darwen is a constituency[n 1] in Lancashire represented in the House of Commons of the UK Parliament since 2024 by Andy MacNae of the Labour Party.

2010–2024: The Borough of Rossendale wards of Cribden, Eden, Facit and Shawforth, Goodshaw, Greensclough, Hareholme, Healey and Whitworth, Helmshore, Irwell, Longholme, Stacksteads, and Whitewell, and the Borough of Blackburn with Darwen wards of Earcroft, East Rural, Fernhurst, Marsh House, North Turton with Tockholes, Sudell, Sunnyhurst, and Whitehall.

Following a local government boundary review in Rossendale which came into effect in May 2024,[4] the constituency now comprises the following from the 2024 general election: The constituency consists of Census Output Areas of two local government districts with similar characteristics: a working population whose income is close to the national average but varying reliance upon social housing in relative terms to the national average.

[6] At the end of 2012 the unemployment rate in the constituency stood as 3.5% of the population claiming jobseekers allowance, compared to the regional average of 4.2%.

In terms of tenure 69.6% of homes are owned outright or on a mortgage as at the 2011 census across the Rossendale district; this compares to a similar 63.7% across Blackburn.