Horsham railway station serves the town of Horsham in West Sussex, England. It is 37 miles 56 chains (60.7 km) down the line from London Bridge, measured via Redhill, on the Arun Valley Line and the Sutton & Mole Valley Lines, and train services are provided by Southern and Thameslink. Services on the Sutton & Mole Valley Line from London Victoria via Dorking terminate here, as do Thameslink services from Peterborough via London Bridge. The other services continue into the Arun Valley: a half-hourly service from London Victoria to Bognor Regis, and hourly services to Southampton Central or Portsmouth & Southsea. These trains usually divide here with the front (Southampton/Portsmouth) portion travelling fast and the rear half providing stopping services.

Horsham is a market town on the upper reaches of the River Arun on the fringe of the Weald in West Sussex, England. The town is 31 miles (50 km) south south-west of London, 18.5 miles (30 km) north-west of Brighton and 26 miles (42 km) north-east of the county town of Chichester. Nearby towns include Crawley to the north-east and Haywards Heath and Burgess Hill to the south-east. It is the administrative centre of the Horsham district.