Horsham is a local government district in West Sussex, England. It is named after the town of Horsham, which is its largest settlement and where the council is based. The district also includes the surrounding rural area and contains many villages, the largest of which are Southwater and Billingshurst. The district includes part of the South Downs National Park and part of the designated Area of Outstanding Natural Beauty of High Weald. At the 2021 census the district had a population of 147,487.

West Sussex is a ceremonial county in South East England. It is bordered by Surrey to the north, East Sussex to the east, the English Channel to the south, and Hampshire to the west. The largest settlement is Crawley, and the county town is the city of Chichester.