This book constitutes the refereed proceedings of the Third International Conference on Virtual and Mixed Reality, VMR 2008, held in San Diego, Ca, USA, in July 2008 in the framework of the 13th International Conference on Human-Computer Interaction, HCII 2009 with 10 other thematically similar conferences. The 71 revised papers presented were carefully reviewed and selected from numerous submissions. The papers accepted for presentation thoroughly cover the thematic area of Virtual and Mixed Reality, addressing the following major topics: interaction and navigation in virtual and mixed environments; design, development and evaluation of VR environments; haptics and tactile interaction in VR; and VR applications.