Round Hill (sometimes spelt Roundhill) is an inner suburban area of Brighton, part of the coastal city of Brighton and Hove in England. The area contains a mix of privately owned and privately rented terraced housing, much of which has been converted for multiple occupancy, and small-scale commercial development. It was developed mostly in the late 19th century on an area of high land overlooking central Brighton, and with good views in all directions, the area became a desirable middle-class suburb—particularly the large terraced houses of Roundhill Crescent and Richmond Road, and the exclusive Park Crescent—and within a few decades the whole of the hill had been built up with smaller terraces and some large villas.
Non-residential buildings include the landmark St Martin's Church, Brighton's largest place of worship, with its dramatically extravagant interior; the Brighton Forum, a Gothic Revival former college now in commercial use; Brighton's main fire station; and the oldest working cinema in Britain. The first hospital in England catering for mental illness was established in a house in Roundhill Crescent in 1905. Brighton's first Jewish cemetery, although a short distance outside Round Hill according to Brighton & Hove City Council's definition, has been associated with the suburb throughout its near 200-year history. The London Road viaduct, a distinctive, sweeping piece of railway architecture, forms the northern boundary of the area and "a literal gateway" between outer and inner suburbia. All of these buildings have been listed by English Heritage for their architectural and historical importance, and the core of Round Hill, around Roundhill Crescent, is one of 34 conservation areas in the city. Round Hill's steep slopes and road layout encouraged the introduction of another feature which gives the area its character: the "cat's-creep" staircase. The area has good tree cover, and increasingly heavy traffic along the three main roads which run through the area.