Hamsey is a village and civil parish in the Lewes district of East Sussex, England. The parish covers a large area and also consists of the villages Offham and Cooksbridge. The main centres of population in the parish are now Offham and Cooksbridge. Around the main settlements are enlarged fields, isolated old cottages and farms. The winding and undulating parish lanes between banks, old hedge rows, trees, flowery verges and ditches are popular with cyclists and give good views of the Downs. In 2011 the parish had a population of 632.