Yin may refer to: *the dark force in the yin and yang from traditional Chinese philosophy and medicine *Yīn (surname) (), a Chinese surname *Yǐn (surname) (), a Chinese surname *Shang dynasty, also known as the Yin dynasty **Yinxu or Yin, the Shang dynasty capital now in ruins *Yin (Five Dynasties period), a short-lived kingdom during China's Five Dynasties and Ten Kingdoms period *Yin Mountains, a mountain range in Inner Mongolia and Hebei province in China *Yin (, ''yǐn''), an office of early China sometimes equivalent to prime minister and sometimes to governor **Prime minister (Chu State), known in Chinese as Lingyin. {{dab