Kewstoke is a civil parish and village in Somerset, England, within the unitary authority of North Somerset, located next to the strip of coast called Sand Bay. Its population in the 2011 census was 1,690.

The parish was part of the Winterstoke Hundred.

The parish council has responsibility for local issues, including setting an annual precept (local rate) to cover the council's operating costs and producing annual accounts for public scrutiny. The parish council evaluates local planning applications and works with the local police, district council officers, and neighbourhood watch groups on matters of crime, security, and traffic. The parish council's role also includes initiating projects for the maintenance and repair of parish facilities, such as the village hall or community centre, playing fields and playgrounds, as well as consulting with the district council on the maintenance, repair, and improvement of highways, drainage, footpaths, public transport, and street cleaning. Conservation matters (including trees and listed buildings) and environmental issues are also of interest to the council.

The parish falls within the unitary authority of North Somerset which was created in 1996, as established by the Local Government Act 1992. Between 1 April 1974 and 1 April 1996, it was in the Woodspring district of the county of Avon. Prior to 1974 the parish was part of the Axbridge Rural District.

An electoral ward with the same name exists. The ward starts at Kewstoke on the Bristol Channel then moves inland to Puxton. The total ward population taken at the 2011 census was 3,380.

The parish is represented in the House of Commons of the Parliament of the United Kingdom as part of the Weston-super-Mare county constituency. It was also part of the South West England constituency of the European Parliament prior to Britain leaving the European Union in January 2020.

Being in places only 6 metres (20 ft) above sea level, the settlements of Kewstoke and Sand Bay are, and have been historically, susceptible to flooding. Following several incidents of flooding a sea defence of combined dune system (sand was imported from the estuary to form this) and concrete walls are now in place along much of Beach Road. Whilst the sea defences have proved very effective for the last two decades, concerns about the long-term stability of the dunes, in particular, remain.

In the Severn Estuary Shoreline Management Plan, 2000, commissioned by the Severn Estuary Coastal Group and carried out by Gifford Associated Consultants, the importance of sea defence maintenance was highlighted. The report stated that leaving the defences unmaintained would increase the risk of a severe flood to the low-lying residential area of Kewstoke and an extensive area of agricultural land that are currently defended. The authors went on to discuss the importance in the shorter and longer term of ensuring that the current defence line is kept and said that monitoring and research of the coastal processes on the foreshore is recommended. The Sand Bay Management Committee is keeping a close eye on the conditions of both the salt marsh and the sand dunes.