Uckfield is a town in the Wealden District of East Sussex in South East England. The town is on the River Uck, one of the tributaries of the River Ouse, on the southern edge of the Weald.

Wealden is a local government district in East Sussex, England. Its council is based in Hailsham, the district's largest town. The district also includes the towns of Crowborough, Polegate and Uckfield, along with numerous villages and surrounding rural areas. The district's name comes from the Weald, the landscape and ancient woodland which occupies much of the centre and north of the area.