A neighbourhood or neighborhood (see spelling differences) is a geographically localised community within a larger city, town or suburb. Neighbourhoods are often social communities with considerable face-to-face interaction among members.

Neighbourhoods in the Past: Preindustrial Cities

The spatial division of cities into districts or neighbourhoods is one of the few universals of urban life from the earliest cities to the present. In the words of the urban scholar Lewis Mumford, “Neighbourhoods, in some primitive, inchoate fashion exist wherever human beings congregate, in permanent family dwellings; and many of the functions of the city tend to be distributed naturally—that is, without any theoretical preoccupation or political direction—into neighbourhoods.” Most of the earliest cities around the world as excavated by archaeologists have evidence for the presence of social neighbourhoods.. Historical documents shed light on neighbourhood life in numerous historical preindustrial or nonwestern cities.

Neighbourhoods are typically generated by social interaction among people living near one another. In this sense they are local social units larger than households not directly under the control of city or state officials. In some preindustrial urban traditions, basic municipal functions such as protection, social regulation of births and marriages, cleaning and upkeep are handled informally by neighbourhoods and not by urban governments; this pattern is well documented for historical Islamic cities.

In addition to social neighbourhoods, most ancient and historical cities also had administrative districts used by officials for taxation, record-keeping, and social control. Administrative districts are typically larger than neighbourhoods and their boundaries may cut across neighbourhood divisions. In some cases, however, administrative districts coincided with neighbourhoods, leading to a high level of regulation of social life by officials. For example, in the T'ang period Chinese capital city Chang'an, neighbourhoods were districts and there were state officials who carefully controlled life and activity at the neighbourhood level.

Neighbourhoods in preindustrial cities often had some degree of social specialization or differentiation. Ethnic neighbourhoods were important in many past cities and remain common in cities today. Economic specialists, including craft producers, merchants, and others, could be concentrated in neighbourhoods, and in societies with religious pluralism neighbourhoods were often the specialized by religion. One factor contributing to neighbourhood distinctiveness and social cohesion in past cities was the role of rural to urban migration. This was a continual process in preindustrial cities, and migrants tended to move in with relatives and acquaintances from their rural past.

The sociology of modern neighbourhood

Over and above these general and individual country definitions, neighbourhoods have several advantages as an area for policy analysis as well as an arena for social action: