The RH postcode area, also known as the Redhill postcode area,[2] is a group of twenty postcode districts in South East England, within seventeen post towns.

These cover east Surrey (including Redhill, Reigate, Betchworth, Dorking, Lingfield, Horley, Oxted and Godstone) and northeastern West Sussex (including Crawley, Gatwick, Haywards Heath, Billingshurst, East Grinstead, Burgess Hill, Horsham and Pulborough) plus small parts of northwestern East Sussex (including Forest Row).

The main sorting office is in Crawley (Gatwick Mail Centre), and the area served includes parts of the Surrey districts of Guildford, Mole Valley, Reigate and Banstead and Tandridge, as well as most of the West Sussex districts of Chichester, Crawley, Horsham, and Mid Sussex, and small parts of the East Sussex districts of Lewes and Wealden.

The approximate coverage of the postcode districts: