Peasmarsh is a village and civil parish in the Rother district, in the county of East Sussex in England.

The village is also home to an independent supermarket, although the proprietors choose not to open their store on Sundays.

The parish council is responsible for local amenities such as the provision of litter bins, bus shelters and allotments.

East Sussex county council is the third tier of government, providing education, libraries and highway maintenance.

Prior to Brexit in 2020, Peasmarsh was part of the South East England constituency in the European Parliament.