Chinese Optical Society (; abbreviated COS) is a professional association of individuals with an interest in optics and photonics. It sponsored the Chinese Optics Letters, a monthly peer-reviewed scientific journal focusing on optics. As of 2019, the society has 21 specialized committees and 7 working committees with more than 15,000 individual members.
The Chinese Optical Society was established by Wang Daheng, Gong Zutong and Qian Linzhao on December 20, 1979. In 1987, it became a member of the International Commission for Optics (ICO).