Klingon planets
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
 H'atoria
 Khitomer (Khitomer system, colony destroyed by Romulan forces in 2346, within Romulan territory as of 2369) 
 Krios Prime
 Maranga IV
 Morska
 Narendra III (attacked by Romulan forces in 2344)
 N'Vak Colony (colony destroyed by Klingon forces in 2154)
 Ogat
 Organia (only briefly occupied in 2267)
 Praxis (Qo'noS system, destroyed in 2293)
 Qo'noS (Qo'noS 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 
 Elas (Tellun system, claimed by the Empire in 2268)
 Forcas III 
 Galorda Prime
 Ganalda IV
 Hitora colony
 Korvat colony
 Neural (claimed by the Empire in 2267)
 Torna IV
 Troyius (Tellun system, claimed by the Empire in 2268)
 Unnamed deuterium mining planet
 Xarantine homeworld

Stars and star systems 
 Beta Lankal
 Beta Thoridar
 Gamma Eridon
 Mempa system
 Pheben 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
 Stevens Nebula
 Klach D'kel Brakt (also called "Briar Patch", in Federation space as of 2375)
 Vodrey Nebula (on the border to Federation space)

See also 
 Federation-Klingon border
 Romulan planets
 Cardassian planets

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