Radcliffe-cum-Farnworth was a parliamentary constituency centred on the towns of Radcliffe and Farnworth in Lancashire. It returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom, elected by the first past the post system.

This area had previously been represented as part of South East Lancashire division. Under the Redistribution of Seats Act 1885, the constituency was created for the 1885 general election and was abolished for the 1918 general election.

The South East Lancashire, Radcliffe-cum-Farnworth Division was defined in the 1885 legislation as consisting of the parishes of Farnworth, Kearsley, Little Hulton and Pilkington (including Whitefield and Unsworth) and the parish of Radcliffe except the area in the Municipal Borough of Bury.^[1][2]

At the next redistribution of seats in 1918, the constituency was split between two new seats: Farnworth (which included Little Hulton and Kearsley) and Heywood and Radcliffe (which took in Unsworth and Whitefield).^[3]