Yin

Yin may refer to:


 * the dark force in the yin and yang from traditional Chinese philosophy and medicine
 * Yīn (surname) (殷), a Chinese surname
 * Yǐn (surname) (尹), 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.