A gangster is a criminal who is a member of a gang. Some gangs are considered to be part of organized crime. Gangsters are also called mobsters, a term derived from mob and the suffix . Gangs provide a level of organization and resources that support much larger and more complex criminal transactions than an individual criminal could achieve. Gangsters have been active for many years in countries around the world.

Gangster! is a role-playing game published by Fantasy Games Unlimited in 1979.