This book constitutes the thoroughly refereed postproceedings of the Third International Workshop on Wirelss and Mobility organized by the European Network of Excellence on Next Generation Internet, EURO-NGI 2006, held in Sitges, Spain in June 2006.The 19 revised full research papers presented were carefully selected during two rounds of reviewing and improvement. The papers are organized in topical sections on WLAN characterization, vehicular networks, WLAN and sensor networks protocols, QoS and routing in ad-hoc networks, heterogeneous networks, resource management in cellular networks, TCP in wireless, and mobility agents.