This book constitutes the refereed proceedings of the International Workshop on Quality of Service in Multiservice IP Networks, QoS-IP 2001, held in Rome, Italy, in January 2001. The 26 revised full papers presented together with two invited papers were carefully reviewed and selected from 39 submissions. The papers are organized in topical sections on connection admission control, statistical bounds, novel architectures for QoS provisioning, QoS for multicast traffic, source modeling, IP telephony, router and switch algorithms, multicast routing, differentiated services, and QoS in wireless networks.