A data security incident correlation and dissemination system and method is disclosed. In an exemplary implementation of the system, a service provider of a managed security service receives incident information regarding data security incidents at different business organizations of the security service. One or more incident managers operated by different organizations send incident information, and a server system within the service provider's network creates aggregated data from the incident information received from the incident managers. The server system analyzes the aggregated data to create correlated incident records that include incident information from related data security incidents at the different organizations, and provides threat intelligence data based on the correlated incident records for the organizations. In embodiments, the server system can “push” threat intelligence data to the organizations, or the organizations can request the threat intelligence data from the server system.