Worth is a civil parish in the Mid Sussex district of West Sussex, a county in southeast England. It includes the villages of Copthorne and Crawley Down, and covers an area of . The population at the time of the 2001 census was 9,888. The ecclesiastical parish was one of the larger West Sussex parishes, encompassing the entire area along the West Sussex/Surrey border between the town of Crawley, east of its High Street, and East Grinstead. The creation of Turners Hill civil parish meant that Worth parish is now only one-third of its original size.
Worth Park House, a large country house, once stood on the Milton Mount housing estate, now part of Pound Hill, Crawley. The house was home to Sir Joseph Montefiore and his family. The gardens have recently been restored.