This volume presents the proceedings of the 11th IFIP/IEEE International Conference on Management of Multimedia and Mobile Networks and Services (MMNS 2008), which was held on Samos, Greece during September 22–26 as part of the 4th International Week on Management of Networks and Services (Manweek 2008). As in the previous three years, the Manweek umbrella allowed an international audience of researchers and scientists from industry and academia – who are researching and developing management systems – to share views and ideas and present their state-of-the-art results. The other events co-located with Manweek 2008 were the 19th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management (DSOM 2008), the 8th IEEE Workshop on IP Operations and Management (IPOM2008), the Third IEEE International Workshop on Modeling Autonomic Communications Environments (MACE2008), the 4th IEEE/IFIP International Workshop on End-to-End Virtualization and Grid Management (EVGM 2008) and the 5th International Workshop on Next-Generation Networking Middleware (NGNM 2008). Under this umbrella, MMNS again proved itself as a top public venue for dissemination of results and intellectual collaboration with specific emphasis on the management of emerging mobile and wireless networks. The objective of the conference is to bring together researchers and scientists from academia and industry interested in state-of-the-art management of converged multimedia networks and services across heterogeneous networking infrastructures.