YJ may refer to:
- Either yottajoule (YJ = 1024 J) or yoctojoule (yJ = 10-24 J), both SI units of energy
- Yahoo! Japan, a website
- Jeep Wrangler, an SUV
- Weekly Young Jump, a magazine
- Young Judaea, a Zionist youth movement
- Young Justice, a DC comic series
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- Young Justice (TV Series), TV series aired on Cartoon Network
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- Young Justice: Legacy, video games based on the TV series.
- Yakitate!! Japan, an anime
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