Helsby is a village, civil parish and electoral ward in the unitary authority of Cheshire West and Chester and the ceremonial county of Cheshire, England. Overlooking the Mersey estuary, it is approximately north east of Chester and south west of Frodsham.
In the 2001 census the civil parish of Helsby had a population of 4,701. By the 2011 census this had risen to 4,972.
The village is situated on the A56 main road between Chester and Runcorn. The neighbouring settlements are Dunham-on-the-Hill, Frodsham, Elton and Alvanley. Helsby is a semi-rural village, with a few dairy and arable farms, but is also in close proximity to a number of industrial plants around the Mersey estuary including the Essar Stanlow Oil Refinery, the Encirc glass bottle manufacturing plant, the Kemira fertiliser plant on Ince Marshes and the Ineos Chlor chemical manufacturing site and power station at Rocksavage. There are few jobs in Helsby itself. The Tesco supermarket is one of the biggest employers in Helsby. The village is popular with commuters as a residential area, due to its links to the M56 motorway and rail networks.
On Helsby Hill, the remains of a promontory hillfort, 1.9ha in area, have been excavated. A buried soil was found under the hillfort containing fossilised pollen dating to the late Mesolithic to early Neolithic, between 7000 and 3001BC. Further evidence suggests a burning episode dating to the early Neolithic occupation or woodland clearance dating to 4000BC to 2351 BC.
The bivallate hillfort is protected on the south and east by two parallel ramparts and an unusual type of inturned entrance 11 yards (10 m) wide. There were three phases of hillfort construction at Helsby. The first stone rampart was constructed in the middle to late Bronze Age (1250-1050 cal BC) and consisted of a bank with a well-dressed outer face of sandstone blocks and an irregular inner face, which was built on a slight batter; it was approximately 4 yards (3.5m) wide. A socketed bronze axe was found at Helsby in 1925.