Taj could refer to:
- IKS Taj (23rd century), a Klingon Defense Force starship in service in the 23rd century
- IKS Taj (attack fighter), a Klingon Defense Force attack fighter in service in the late 23rd century
- IKS Taj (24th century), a Klingon Defense Force bird-of-prey in service in the 24th century
- IKS Taj (Tor'Kaht-class), a Klingon Defense Force Tor'Kaht-class battlecruiser in service to the House of Martok on the early 25th century
- Taj-class, a class of Klingon bird-of-prey used by the Klingon Empire in the mirror universe in the late 23rd century
- Taj (Klingon), a Klingon clan ritual tool
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