Seiryu, Seiryū, or Seiryuu may refer to:
- Azure Dragon, a Chinese constellation symbol
- Seiryu (YuYu Hakusho), a character in YuYu Hakusho anime
- Seiryū (Fushigi Yūgi), a character in Fushigi Yūgi anime
- Seiryu, a cultivar of the Japanese maple
- Seiryū Inoue (1931–1988), Japanese photographer
- Seiryu stone, a kind of stone popular in aquariums, especially for aquascaping
- Seiryuu, the guardian of the East Gate of The Imperial Palace in Accel World
- JS Seiryū (SS-509), a Japanese Sōryū-class submarine
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