Community theatre refers to any theatrical performance made in relation to particular communities—its usage includes theatre made by, with, and for a community. It may refer to a production that is made entirely by a community with no outside help, or a collaboration between community members and professional theatre artists, or a performance made entirely by professionals that is addressed to a particular community. Community theatres range in size from small groups led by single individuals that perform in borrowed spaces to large permanent companies with well-equipped facilities of their own. Many community theatres are successful, non-profit businesses with a large active membership and, often, a full-time staff. Community theatre is often devised and may draw on popular theatrical forms, such as carnival, circus, and parades, as well as performance modes from commercial theatre. This type of theatre is ever-changing and evolving due to the influences of the community; the artistic process can often be heavily affected by the community's socioeconomic circumstances.

A community is a social unit with a shared socially significant characteristic, such as place, set of norms, culture, religion, values, customs, or identity. Communities may share a sense of place situated in a given geographical area or in virtual space through communication platforms. Durable good relations that extend beyond immediate genealogical ties also define a sense of community, important to their identity, practice, and roles in social institutions such as family, home, work, government, TV network, society, or humanity at large. Although communities are usually small relative to personal social ties, "community" may also refer to large group affiliations such as national communities, international communities, and virtual communities.