The following is a list of mentioned planets and star systems in the Klingon Empire. All planets listed are or were inhabited at some point of time.

Planets

• Archanis IV (Archanis sector, ceded to the Federation in the 23rd century, reconquered in 2373)
• Boreth
• Forcas III
• Ganalda IV (conquered by the Federation in 2373)
• H'atoria
• Khitomer (colony destroyed by Romulan forces in 2346, within Romulan territory as of 2369)
• Krios Prime
• Maranga IV (Maranga system)
• Morska
• Narendra III (Narendra system, attacked by Romulan forces in 2344)
• N'Vak colony (colony destroyed by Klingon forces in 2154)
• Organia (only briefly occupied in 2267)
• Praxis (Klingon system, destroyed in 2293)
• Qo'noS (Klingon system)
• Qu'Vat colony
• Raatooras
• Rura Penthe (Beta Penthe system)
• Sherman's Planet (shared possession in 2267, granted to the Federation as of 2269)
• Ty'Gokor

Uncertain

• Donatu V
• Hitora colony
• Korvat colony
• Neural (claimed by the Empire in 2267)
• Elas (Tellun system, claimed by the Empire in 2268)
• Troyius (Tellun system, claimed by the Empire in 2268)
• Tessic's colony
• Xarantine homeworld

Stars and star systems

• Beta Lankal
• Beta Thoridar
• Gamma Eridon
• Mempa system

Other stellar phenomena

• Azure Nebula (on the border to Federation space)
• Baber Nebula
• Barnes Nebula
• Betreka Nebula (uncertain, may not really border the Klingon Empire)
• Gullory Nebula
• Hodges Nebula
• Klach D'Kel Brakt (in Federation space as of 2375)
• Vodrey Nebula (on the border to Federation space)

See also

• Federation-Klingon border
• Romulan planets
• Cardassian planets