Resource/service discovery is a very critical issue in intergrid (grid of grids) system, which is the recent advancement in grid technology that uses multi-middleware. In this paper we present an intergrid service discovery framework that integrates semantic technology, peer-to-peer network and intelligent agents. The framework has two main components which are service description, and service registration and discovery models. The earlier consists of a set of ontologies that are used as a data model for service description and services to accomplish the description process. The service registration is also based on ontology, where nodes of the services (service providers) are classified to some classes according to the ontology concepts, which means each class represents a concept in the ontology. Each class will have an elected head that plays the role of a registry in its class and handles the interclass communication. We further introduce intelligent agents to automate the discovery process. The framework is evaluated via simulation experiments, and the result of which confirms the effectiveness of the framework in satisfying the required RD features (interoperability, scalability, decentralization and dynamism). © 2011 Springer-Verlag.