This Proceedings contains the papers presented at the 3rd Workshop on Advanced Accelerators. Some of the topics include; laser and particle beam wakefield acceleration, plasma lenses, ion channel transport, high-power RF sources, two-beam accelerators, beam-beam interactions, and high brightness photo cathodes. This Conference Proceedings will present an up-to-date survey of the critical physics issues in advanced accelerator condepts. Researchers involved in particle beam and accelerator physics. As a reference to workers in the field. Research labs, libraries.