Alpha Quadrant
The Alpha Quadrant was the common designation for one-quarter of the Milky Way Galaxy. It was adjacent to the Beta Quadrant and the Gamma Quadrant. One-quarter of the galactic core was located in this quadrant. (, Season 7 production art;   display graphics) 

In late 24th century interstellar politics and diplomacy, the four great powers in the Alpha Quadrant were the United Federation of Planets, the Cardassian Union, the Klingon Empire, and Romulan Star Empire, though majority of the territory held by the latter two was found in the Beta Quadrant. Other powers at the time were divided into two groups. The mercantile powers, like the Ferengi Alliance, traded with the great powers. The isolationist powers, like the Breen Confederacy and the Tholian Assembly, defended their territory aggressively and would, on occasion, battle with other powers. (; ;  display graphics)  By the late 23rd century, the Alpha Quadrant still remained largely unexplored by the . ()

The Bajoran wormhole connected the Bajoran sector in the Alpha Quadrant to a point near the Idran system on the far side of the Gamma Quadrant near Dominion space. The use of this wormhole for exploration and trade by parties from the Alpha Quadrant incited hostility from the Dominion, culminating in the Dominion War. ()

The Borg maintained at least one transwarp hub and thousands of exit apertures in the Alpha Quadrant until 2378, when the entire transwarp network was destroyed by the . ()

In the alternate 2259, a section of this quadrant, from a galactic map, was in a collection of graphics and video media that were seen on a powerwall in the offices of Admirals  and  at Starfleet Headquarters. The map was being used primarily for charting activity on the Neutral Zone, Sectors 45 to 89. The three largest powers in this section – the Federation, the Klingon Empire, and the Orion Union – were labeled on this map. ()

In the mirror universe 2370, according to , the Klingon-Cardassian Alliance controlled "the entire quadrant". ()

Major governments 
 Breen Confederacy
 Cardassian Union 
 Ferengi Alliance
 Klingon Empire (from the 9th century)
 Romulan Star Empire (until 2387)
 Tholian Assembly
 United Federation of Planets (from 2161)
Other timelines/realities
 Klingon-Cardassian Alliance (mirror universe)
 Terran Empire (mirror universe)
 Orion Union (alternate reality)
 Cardassian Empire (alternate timeline)

Other societies
 Bajoran Republic
 Barzanian Planetary Republic
 Coalition of Madena
 Council of Nobles
 Eminian Union
 First Federation
 Gideon Council
 Orion Syndicate
 Kzinti government
 Talarian Republic
 Vendikar High Council

Homeworlds 
 Akaali homeworld
 Algol I
 Alpha Majoris I
 Andoria
 Angel I
 Arret
 Bajor
 Barzan II
 Benzar
 Betazed
 Bolarus IX
 Camus II
 Capella IV
 Cardassia Prime
 Coridan
 Cygnet XIV
 Delta IV
 Deneb IV
 Draylax
 Earth (Sol III)
  (FGC-347601 III)
 Elas
 Eminiar VII
 Evora homeworld
 Fabrini homeworld
 Ferenginar
 Galen IV
 Gamma Trianguli VI
 
 Golana
 Janus VI
 Kiley 279
 Klaestron IV
 
 Kzin
 Lactra VII
 Mizar II
 O'Ryan's Planet
 Omega Cygni
 Organia
 
 Peliar Zel II
 Pollux IV
 Phylos
 Rigel IV
 Rigel VII
 Risa
 Sarpeidon
 Scalos
 Setlik II
 Sigma Draconis III
 Sigma Draconis IV
 Sigma Draconis VI
 Tagra IV
 Talarian homeworld
 Talos IV
 Taurus II
 Tellar Prime
 Torothan homeworld
 Trill
 Troyius
 Tzenketh
 Valakis
 
 Zetar

Colonies and Outposts 
 Adarak Prime
 Aldebaran III
  (planet)
 AR-558
 Arawath Colony
 Atbar Prime
 Athos IV
 Atlec
 Avenal VII
 
 Bajor VIII
 Barisa Prime
 Benecia (Benecia Colony)
 Bryma (Bryma Colony)
 Cardassia III
 Cardassia IV
 Cardassia V
 Ceti Alpha V
 Delta Outpost
 Delta Outpost 4
 Delta Outpost 5
 Delta Outpost 6
 Delta Outpost 7
 Delta Outpost 8
 Deneva (Deneva colony)
 Draylon II
 Dreon VII
 Empok Nor
 Felton Prime
 Galen IV (Galen IV colony)
 Gamma 7 outpost
 Hakton VII
 Iridin
 Juhraya
 Korma
 L5 colony
 Loval
 Luna (Lunar colonies)
 Lya Station Alpha
 M'kemas III
 Mantilles
 Manzar
 Marcos XII
 Mars (Sol IV) (Martian colonies)
 Marva IV
 Memory Alpha
 
 Mudd
 Omicron Ceti III
 Ophiucus III
 Outpost 47
 Outpost 61
 Orellius
 Orion Sector Tactical Command
 Peliar Zel Alpha
 Peliar Zel Beta
 Pentath III
 Planet Q
 Platonius
 Portas V
 Prophet's Landing
 Quatal Prime
 Rigel VII Lagrange colony
 Rigel X
 Salva II
 Setlik III
 Sheva II
 Solarion IV (Solarion IV colony)
 Solosos III
 Soltok IV
 Straleb
 Titan
 Tracken II
 Trelka V
 Umoth VIII
 Vega colony
 Vendikar
 Volan II
 Volan III

Starbases 
 Deep Space 9
 Eminiar VII Starbase
 Starbase 2
 Starbase 4
 Starbase 9
 Starbase 10
 Starbase 11
 Starbase 12
 Starbase 21
 Starbase 25
 Starbase 29
 Starbase 32
 Starbase 46
 Starbase 47
 Starbase 62
 Starbase 74
 Starbase 200
 Starbase 211
 Starbase 214
 Starbase 237
 Starbase 257
 Starbase 310
 Starbase 375
 Starbase 621
 Starbase 0834
 Starbase 4077
 Starbase G-6

Spatial landmarks 
 Arachnid Nebula
 Argolis Cluster
 Badlands
 Bajoran wormhole
 Barzan wormhole
 Beta Niobe Nebula
 Borias Cluster
 Briar Patch
 Helaspont Nebula
 Hugora Nebula
 McAllister C-5 Nebula
 Murasaki 312
 NGC 321
 Rolor Nebula
 Talos star group
 Tibor Nebula
 Tong Beak Nebula

Appendices

See also 
 Beta Quadrant
 Gamma Quadrant
 Delta Quadrant

Related links 
 Unnamed Alpha and Beta Quadrant planets
 Unnamed Alpha and Beta Quadrant starships

External link

Background information 

In the script for , the Cardassian vole was described as being "the Alpha Quadrant's nominee for ugliest creature in the galaxy".

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