Horsham is a market town and civil parish located in West Sussex, England. Situated on the upper reaches of the River Arun on the fringe of the Weald, the town is positioned approximately 31 miles south-south-west of London, 18.5 miles north-west of Brighton, and 26 miles north-east of Chichester.
The town serves as the administrative centre for the Horsham district. As of 2018, it had an estimated population of 50,934. It is located near several other towns, including Crawley to the north-east and Haywards Heath and Burgess Hill to the south-east.