Yin may refer to:

• Yin Mountains, a mountain range in Inner Mongolia and Hebei province in China.
• Yin (city), the last capital of the Yin Dynasty.
• Yin (surname), a rare Chinese surname of descendents from the dynasty above.
• Yin, The fictional character from the Disney/Jetix show Yin Yang Yo!.
• Yin (character), The fictional character from the anime series Darker Than Black.
• Yin (Ten Kingdoms), a short-lived kingdom of China's Five Dynasties and Ten Kingdoms Period
• Yin Dynasty, also known as the Shang Dynasty, the first historic Chinese nation and dynasty
• Yin and yang, two opposing forces in traditional Chinese philosophy and medicine

Yin could refer to these people:

• Yin Chengzong, premier Chinese pianist and composer who arranged the Yellow River Concerto
• The Big Yin, nickname of Billy Connolly

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