Chinese Optical Society (simplified Chinese: 中国光学学会; traditional Chinese: 中國光學學會; pinyin: Zhōngguó Guāngxué Xuéhuì; 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).