Urban sociology is the sociological study of cities and urban life. One of the field's oldest sub-disciplines, urban sociology studies and examines the social, historical, political, cultural, economic, and environmental forces that have shaped urban environments. Like most areas of sociology, urban sociologists use statistical analysis, observation, archival research, census data, social theory, interviews, and other methods to study a range of topics, including poverty, racial residential segregation, economic development, migration and demographic trends, gentrification, homelessness, blight and crime, urban decline, and neighborhood changes and revitalization. Urban sociological analysis provides critical insights that shape and guide urban planning and policy-making.

The philosophical foundations of modern urban sociology originate from the work of sociologists such as Karl Marx, Ferdinand Tönnies, Émile Durkheim, Max Weber and Georg Simmel who studied and theorized the economic, social and cultural processes of urbanization and its effects on social alienation, class formation, and the production or destruction of collective and individual identities.

These theoretical foundations were further expanded and analyzed by a group of sociologists and researchers at the University of Chicago in the early twentieth century. In what became known as the Chicago School of sociology the work of Robert Park, Louis Wirth and Ernest Burgess on the inner city of Chicago revolutionized not only the purpose of urban research in sociology but also the development of human geography through its use of quantitative and ethnographic research methods. The importance of theories developed by the Chicago School within urban sociology has been both sustained and critiqued; yet it remains one of the most significant historical advancements in understanding urbanization and the city within the social sciences. The discipline may draw from several fields, including cultural sociology, economic sociology, and political sociology.

Urban sociology rose to prominence among North American academics through a group of sociologists and theorists at the University of Chicago from the 1910s to the 1940s, who came to be known as the Chicago School of Sociology. The Chicago School of Sociology combined sociological and anthropological theory with ethnographic fieldwork to understand how individuals, groups, and communities interact within urban social systems. Unlike the primarily macro-based sociology that had marked earlier subfields, members of the Chicago School placed greater emphasis on micro-scale social interactions that sought to provide subjective meaning to how humans interact under structural, cultural, and social conditions. The theory of symbolic interaction, the basis through which many methodologically groundbreaking ethnographies were framed in this period, took its primitive shape alongside urban sociology and shaped its early methodological leanings. Symbolic interaction was forged out of the writings of early micro-sociologists George Mead and Max Weber, and sought to frame how individuals interpret symbols in everyday interactions. With early urban sociologists framing the city as a 'superorganism', the concept of symbolic interaction helped parse how individual communities contribute to the seamless functioning of the city itself.

Scholars of the Chicago School originally sought to answer a single question: how did the rise of urbanism during the Industrial Revolution contribute to the magnification of contemporary social problems? Sociologists centered on Chicago due to its tabula rasa state, having expanded from a small town of 10,000 in 1860 to an urban metropolis of over two million in the next half-century. Along with this expansion came many of the era's emerging social problems – ranging from issues with concentrated homelessness and harsh living conditions to the low wages and long hours that characterized the work of the many newly arrived European immigrants. Furthermore, unlike many other metropolitan areas, Chicago did not expand outward at the edges as predicted by early expansionist theorists, but instead 'reformatted' the available space in a concentric-ring pattern. As with many modern cities, the business district occupied the city center and was surrounded by slums and blighted neighborhoods, which were further surrounded by workingmen's homes and the early forms of the modern suburbs. Urban theorists suggested that these spatially distinct regions helped to solidify and isolate class relations within the modern city, moving the middle class away from the urban core and into the privatized environment of the outer suburbs.

Due to the high concentration of first-generation immigrant families in the inner city of Chicago during the early 20th century, many prominent early studies in urban sociology focused on the transmission of immigrants' native culture roles and norms into new and developing environments. Political participation and the rise of inter-community organizations were also frequently covered during this period, with many metropolitan areas adopting census techniques that enabled information to be stored and easily accessed by participating institutions such as the University of Chicago. Park, Burgess, and McKenzie, professors at the University of Chicago and three of the earliest proponents of urban sociology, developed the Subculture Theories, which helped to explain the often-positive role of local institutions on the formation of community acceptance and social ties. When race relations break down, and expansion renders one's community members anonymous, as was proposed to be occurring in this period, the inner city becomes marked by high levels of social disorganization that prevents local ties from being established and maintained in local political arenas.

The rise of urban sociology coincided with the expansion of statistical inference in the behavioral sciences, which helped ease its transition and acceptance within educational institutions, alongside other burgeoning social sciences. Micro-sociology courses at the University of Chicago were among the earliest and most prominent in the United States on urban sociological research.

The evolution and transition of sociological theory from the Chicago School began to emerge in the 1970s with the publication of Claude Fischer's (1975) "Toward a Theory of Subculture Urbanism" which incorporated Bourdieu's theories on social capital and symbolic capital within the invasion and succession framework of the Chicago School in explaining how cultural groups form, expand and solidify a neighbourhood. The theme of transition by subcultures and groups within the city was further expanded by Barry Wellman's (1979) "The Community Question: The Intimate Networks of East Yorkers", which determined the function and position of the individual, institution, and community in the urban landscape in relation to their community. Wellman's categorization and incorporation of community-focused theories, such as "Community Lost", "Community Saved", and "Community Liberated", which center around the structure of the urban community in shaping interactions between individuals and facilitating active participation in the local community, are explained in detail below: