Plumpton is a village and civil parish in the Lewes District of East Sussex, England. The village is located 5 mi north-west of Lewes. The parish measures 6.5 mi in length on its north–south axis and 1 mi at its widest on the B2116 Underhill Road. The southern half of the parish lies within the South Downs National Park and at the highest point, 214 m, the South Downs Way traverses the crest of Plumpton Plain.