YJ

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
  • Young Justice (TV Series), TV series aired on Cartoon Network
  • Young Justice: Legacy, video games based on the TV series.
  • Yakitate!! Japan, an anime