The IKS Bacjen was a Gel'joQ-class battleship that saw service with the Klingon Empire during the 24th century. (Ship Recognition Manual, Volume 3: Ships of the Klingon Empire)

In 2375, the Bacjen created a hole in the enemy's lines during the Battle of the Hobileth Nebula by destroying three Galor-class battle cruisers before it was destroyed by Jem'Hadar warships.