Runcorn was a rural district in Cheshire, England from 1894 until 1974. It was named after but did not include Runcorn, a town on the River Mersey to the north-west of the district, which formed its own urban district.
The district was abolished in 1974 under the Local Government Act 1972. It was split between the new districts of Vale Royal, Warrington and Halton, with the parishes of Appleton, Grappenhall, Hatton, Stockton Heath, Stretton, and Walton going to Warrington; the parishes of Daresbury, Moore and Preston Brook going to Halton (with Runcorn town), and the rest going to Vale Royal (now Cheshire West and Chester). The council had its offices at Castle Park in Frodsham.