Internal communications (IC) is the function responsible for effective communications among participants within an organization. The scope of the function varies by organization and practitioner, from producing and delivering messages and campaigns on behalf of management, to facilitating two-way dialogue and developing the communication skills of the organization's participants.

Internal communication is meant by a group of processes that are responsible for effective information circulation and collaboration between the participants in an organization. Modern understanding of internal communications is a field of its own and draws on the theory and practice of related professions, not least journalism, knowledge management, public relations (e.g., media relations), marketing and human resources, as well as wider organizational studies, communication theory, social psychology, sociology and political science.