All Saints' Church is the parish church of Runcorn, Cheshire, England, sited on the south bank of the River Mersey overlooking Runcorn Gap. There is a tradition that the first church on the site was founded by Ethelfleda in 915. That was replaced, probably in about 1250, by a medieval church that was altered and extended in the 14th and 15th centuries. By the 19th century the building's structure had deteriorated and become dangerous, and it was replaced by a new church, built between 1847 and 1849 to the designs of Anthony Salvin.