The Third Asian-Pacific Conference of Theoretical and Computational Chemistry (APCTCC) will be held in Beijing on September 22-26, 2007, co-organized by Beijing Normal University and Peking University. The first and second conferences in this series were held successfully in Okazaki (2004) and Bangkok (2005), respectively. This meeting will cover the topics in both methodological developments and applications of quantum chemistry and molecular dynamics simulations. It is our hope that this will be a great gathering of theoretical and computational chemists in this part of the world and a good platform for us to exchange ideas and recent progress in our research. A group of distinguished colleagues have already committed to give plenary or invited lectures (see below). We expect that more distinguished colleagues will be added into the list.