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.
• Kyrgyz Railways
• Kolej Tuanku Ja'afar

• Rans S-17
• Rans S-17 Stinger
• Rans S-18
• Rans S-18 Stinger
• Rans S-18 Stinger II
• Rans S-19
• Rans S-19 Venterra
• Rans S-4
• Rans S-4 Coyote
• RANS S-4 Coyote
• Rans S-5
• RANS S-5 Coyote
• Rans S-5 Coyote
• RANS S-6 Coyote II
• Rans S-6 Coyote II
• Rans S-6ES
• RANS S-6ES Coyote
• Rans S-6S
• Rans S-7
• Rans S-7C
• Rans S-7C Courier
• Rans S-7 Courier
• Rans S-7LS
• Rans S-7S
• Rans S-9