This book constitutes the thoroughly refereed post-conference proceedings of the Third International Conference on Access Networks, AccessNets 2008, held in Las Vegas, NV, USA, in October 2008.The 30 revised full papers presented together with 5 invited papers were carefully reviewed and selected. The papers present original and fundamental research advances in the area of access networks, such as hybrid access networks, passive optical networks, fiber assisted wireless for broadband access networks, carrier ethernet and the evolving access networks, wireless access networks dsl networks dynamic spectrum management (dsm) successes, plc and dsl networks, as well as access network performance.