The 6th International Conference on Optimization and Control with Applications (6thOCA) is organized by Changsha University of Science & Technology (China) and Curtin University (Australia). It will be held at International Academic Exchange Center of Changsha University of Science & Technology, Changsha, China on December 12th-14th, 2015. The previous five conferences of the OCA conference series were held in Erice, Italy (2001), Tunxi, China (2002), Jiuzhaigou, China (2004), Harbin, China (2009), and Beijing, China (2012), respectively. As a continuation of the OCA series, the goal of the 6th OCA is to provide an international forum for scientists, engineers, researchers, and practitioners to exchange ideas and approaches, to present research findings and state-of-the-art solutions, to share experiences on potentials and limits, and to open new avenues of research and developments, on all issues and topics related to optimization and control.