KTJ may refer to:
The post nominal of a Knight in the Knights Templar or Ordo Supremus Militaris Templi Hierosolymitani. A Knight wears a red, patriarchal cross edged in gold, suspended below a crown, on the red and black neck ribbon of the Order. Katibat al-Tawhid wal-Jihad, an Uzbek/Kyrgyz jihadist militant organization based in Syria Kyrgyz Railways Kolej Tuanku Ja'afar