The Khitomer system was an inhabited star system in the Klingon Empire. This system contained the inhabited planet Khitomer. The planet was the location of Camp Khitomer and a Klingon colony which fell victim to a Romulan attack in 2346. (TNG: "Sins of the Father", display graphic)
In 2369, the location of Khitomer was labeled on the Deep Space 9 Traffic Comm Database star chart. (TNG: "Birthright, Part II", display graphic)
The name of this system appeared in a display readout that appeared in "Sins of the Father" but was not referenced in dialog.