Abstract: The present invention provides a common data entity broker method, system, and program product. Specifically, under the present invention, a common data broker is provided that includes an administrative module, a common data broker interface, a common data key mapping, and a common data database. In general, common data entities are stored in the common data database according to their assigned common data entity type and common data entity key. The common data mapping contains an association of each common data entity to its common data entity type and common data entity key. The mapping also associates common data entity types and common data entity keys with external key and external data entity types that are used by external systems/systems requesting a common data entity.