Narrowcasting is the dissemination of information (usually via Internet, radio, newspaper, or television) to a narrow audience, rather than to the broader public at-large. Related to niche marketing or target marketing, narrowcasting involves aiming media messages at specific segments of the public defined by values, preferences, demographic attributes or subscription. Narrowcasting is based on the postmodern idea that mass audiences do not exist.

The term narrowcasting can also apply to the spread of information to an audience (private or public) which is by nature geographically limited—a group such as office employees, military troops, or conference attendees—and requires a localized dissemination of information from a shared source.