Frodsham ˌfrɒdʃəm is a market town, civil parish, and electoral ward in the unitary authority of Cheshire West and Chester and the ceremonial county of Cheshire, England. Its population was 8,982 in 2001, increasing to 9,077 at the 2011 Census. It is south of Liverpool and 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 exhibits evidence of a building present in the 12th century in its nave and is referenced in the Domesday Book. A market is held each Thursday, and Frodsham's viability as a trading centre was emphasised by the presence of the "big five" clearing banks and several building societies, though the branches of HSBC and NatWest have recently closed. Development in the town's shops and premises with alcohol licences is evident through the opening or modernisation of contemporary-style bar, restaurants, take-aways, and public houses since 2002, and in the continued presence of small, specialised, businesses operating from town-centre shops.
The etymology of Frodsham's name is not entirely clear. It is called Frotesham in the Domesday Book. A literal translation of the Old English would give personal name of Frod or an old spelling of Ford, and ham which means a village or homestead; hence Frod's village or the Village on the Ford (Ford-ham). However, an alternative, more obscure etymology exists which suggests the name means "promontory into marsh", which would make sense considering that Frodsham had a promontory castle very close to marshland. Frodsham is unique as the name of a settlement in the British Isles. Earlier spellings of the name have included Fradsham, Frandsham, Frodisham, Ffradsam and Ffradsham.
Frodsham Hill is the location of an Iron Age promontory fort, the outline of which can still be seen.