This book constitutes the refereed proceedings of the 7th IEEE International Conference on High Speed Networking and Multimedia Communications, HSNMC 2004, held in Toulouse, France in June/July 2004.The 101 revised full papers presented were carefully reviewed and selected from 266 submissions. The papers are organized in topical sections on quality of service, QoS, DiffServ, and performance analysis; scheduling and resource allocation; MPLS; routing and multicast; mobile networks, mobile IP, 3G/UMTS; IEEE 802.11 networks and ad hoc networks; wireless and WLAN; optical networks and WDM; applications and software development; and security and privacy.