The Fourth Asia-Pacific Workshop on Chaos Control and Synchronization (APW-CCS) is organized by the Centre for Chaos and Complex Networks, City University of Hong Kong and Hong Kong Polytechnic University, co-organized by the China Institute of Atomic Energy and hosted by the Heilongjiang University, China. The workshop is sponsored by the IEEE CAS (Circuits and Systems Society) and the IEEE CAS Nonlinear Circuits and Systems Technical Committee. The main purpose of this Workshop is to bring together some leading researchers and experts worldwide, especially those from the Asia-Pacific region, to further promote and develop the cutting-edge research on chaos control and synchronization theories and their engineering applications.