Frodsham is a market town and civil parish in the unitary authority of Cheshire West and Chester and the ceremonial county of Cheshire, England. Its population was 8,982 in the UK census of 2001. It is approximately 3 miles (5 km) south of Runcorn, 16 miles (26 km) south of Liverpool, and 28 miles (45 km) southwest of Manchester. The River Weaver runs to its northeast and on the west it overlooks the estuary of the River Mersey. The A56 road and the Chester–Manchester railway line pass through the town, and the M56 motorway passes to the northwest.
In medieval times Frodsham was an important borough and port belonging to the Earls of Chester. Its parish church, St. Laurence's, still shows evidence of a building present in the 12th century in its nave and is referenced in the Domesday Book.