Wei (魏) refers to:

• Northern Wei Dynasty, archaeologically the most famous of the Wei dynasties
• The State of Wei during the Spring and Autumn Period and the Warring States Period
• The Kingdom of Wei during the Three Kingdoms Period
• The Kingdom of Wei founded by Ran Min during the Period of Wu Hu.
• a Chinese family name
  • Wei Yan a military officer of Shu during the Three Kingdoms Period
  • Wei Jingsheng a Chinese dissident

Wei (Simplified: 卫, Traditional: 衛) refers to:

• The State of Wei during Spring and Autumn Period and the Warring States Period
• a Chinese family name. Notable Weis include:
  • Lady Wei Shuo, calligrapher

Wei (倭) refers to:

• An ancient name of Japan, transcribed as Wa from Japanese and Wae from Korean. See Wei.