Community organizing is a process where people who live in proximity to each other come together into an organization that acts in their shared self-interest. A core goal of community organizing is to generate durable power for an organization representing the community, allowing it to influence key decision-makers on a range of issues over time. In the ideal, for example, this can get community organizing groups a place at the table before important decisions are made. Community organizers work with and develop new local leaders, facilitating coalitions and assisting in the development of campaigns.

Organized community groups attempt to influence government, corporations and institutions, seek to increase direct representation within decision-making bodies, and foster social reform more generally. Where negotiations fail, these organizations seek to inform others outside of the organization of the issues being addressed and expose or pressure the decision-makers through a variety of means, including picketing, boycotting, sit-ins, petitioning, and electoral politics. Organizing groups often seek out issues they know will generate controversy and conflict. This allows them to draw in and educate participants, build commitment, and establish a reputation for winning. Thus, community organizing is usually focused on more than just resolving specific issues. In fact, specific issues are often vehicles for other organizational goals as much as they are ends in themselves.

Saul David Alinsky (January 30, 1909 – June 12, 1972) was an American community organizer and writer. He is generally considered to be the founder of modern community organizing, and has been compared to Thomas Paine as being "one of the great American leaders of the nonsocialist left." He is often noted for his book Rules for Radicals.

In the course of nearly four decades of political organizing, Alinsky received much criticism, but also gained praise from many public figures. His organizing skills were focused on improving the living conditions of poor communities across North America. In the 1950s, he began turning his attention to improving conditions of the African-American ghettos, beginning with Chicago's and later traveling to other ghettos in California, Michigan, New York City, and a dozen other "trouble spots".

His ideas were later adapted by some U.S. college students and other young organizers in the late 1960s and formed part of their strategies for organizing on campus and beyond.Time magazine once wrote that "American democracy is being altered by Alinsky's ideas," and conservative author William F. Buckley said he was "very close to being an organizational genius."