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

History 
Vash commented that some of the cultures she had encountered in the Gamma Quadrant had histories spanning millions of years. () It is believed the Hur'q originated from the quadrant. ()

Using their system of gateways, the Iconians were able to settle the world of Vandros IV, on the edge of the Gamma Quadrant. ()

Exploration 
The quadrant was first explored by the Federation's Quadros-1 probe in the 22nd century. ()

A Barzan probe sent through the Barzan wormhole discovered that the Gamma Quadrant terminus was located beyond the Denkiri Arm, a distance that at warp 9 would have taken nearly a century to cover, this later shifted to the Delta Quadrant and the wormhole was discovered to be unstable. ()

In 2369, the Bajoran wormhole in the Bajoran system was discovered. This wormhole had a terminus in the Gamma Quadrant that was four light years from the Idran system. This wormhole linked this quadrant with the Alpha Quadrant. ()

Tosk, a , came through the Bajoran Wormhole from the Gamma Quadrant and docked at Deep Space 9 on a hunt and was pursed by Hunters. The Hunters said that the Tosk was bred to be hunted by them and had spent his entire life preparing; later the Hunters were allowed to resume the hunt and take the Tosk back with them to the Gamma Quadrant after Chief O'Brien helped the Tosk to escape and return through the Bajoran Wormhole into the Gamma Quadrant. ()

The archaeologist Vash explored the Gamma Quadrant for two years at the invitation of Q in 2367. She was found there in 2369 by members of Deep Space 9's crew. (; )

Deep Space 9 had the distinction of making first contact with a Gamma Quadrant species known as the Wadi. However, the Wadi showed no interest in formalities and headed straight to Quark's. The Ferengi initially saw the Wadi as a potential source of great profit, but when the Wadi Master Surchid Falow started to win at Dabo and went on a winning streak, Quark had one of his waiters rig the game. The Wadi caught him and forced Quark to play "an honest game" called Chula, using living people as players, but this was revealed later to be only a game and not really dangerous. ()

Kai Opaka was taken through the Bajoran Wormhole by Benjamin Sisko, where they received a distress signal. They then found a planet with a network of satellites, one of which was malfunctioning. Their runabout approached the planet and one of the satellites attacked it, forcing them to crash land. Opaka died in the landing, which devastated Kira; however, Kira's mourning was interrupted by a group of people called the Ennis, who were at war with a group called the Nol-Ennis, both groups being constantly regenerated by some form of extraterrestrial nanotechnology. Rather than a blessing, this technology was a curse: the two groups had been sent to the planet as punishment for centuries of conflict, doomed to die over and over. A regenerated Kai Opaka accepted that she could not leave the planet in the Gamma Quadrant and felt called to help the two warring factions learn how to live in peace. ()

The Vulcans were at the forefront of the exploration of the quadrant, beginning only months after the wormhole was discovered by Benjamin Sisko and Jadzia Dax in 2369. The Vulcans made many discoveries, including the remains of the Hur'q race. () 

The Klingons showed an interest in exploring the Gamma Quadrant shortly after its discovery by sending their own scout ships to the quadrant. () The  was among the first ships to explore the quadrant in an effort to establish colonies on the other side of the wormhole. The Klingons also operated freighters to the quadrant. ()

On the other hand, no Romulan ship had ever been to the Gamma Quadrant until late 2371 during the Tal Shiar's abortive attack on the . ()

The Ferengi saw the Gamma Quadrant as an enormous opportunity to make a profit and their reputations would be, as  put it, "absolutely stainless". ()

The Bajorans also colonized a planet in the Gamma Quadrant, New Bajor, in late 2370. Unfortunately, the planet was invaded by the Jem'Hadar, who massacred the population. ()

The planet Meridian was also located in the Gamma Quadrant, but it spent most of its time in another phase of existence, in which its people existed only as consciousness, with no physical beings. The planet was in our dimension for a very short time. After twelve days in the Gamma Quadrant, it disappeared for sixty years. Each time it returned, the planet had less time in this universe, and eventually will stop appearing. () 

The starship  was caught in a type of "quantum bubble" surrounding an inhabited Gamma Quadrant planet. After investigation, it was discovered that the inhabitants were the descendants of the Defiants crew. Generations of descendants had been living on the planet for many years and their own history began when the Defiant tried to escape from the bubble. Instead of passing through its energy barrier, the ship was thrown back in time two centuries and crashed with no hope of contacting the Federation or repairing the ship. Faced with that reality, the small stranded crew of the Defiant (including Dax, Sisko, and O'Brien) decided to remain and establish a society. ()

In 2383, the 's proto-drive unexpectedly brought them nearly 4,000 light years from their position in the Delta Quadrant to the Gamma Quadrant. ()

The Dominion 
The Dominion was established approximately ten thousand years prior to 2375. This galactic power was located between forty and fifty thousand light years from the galactic core in an arm of the galaxy. Other powers had been encountered, but their status with the Dominion was unclear. (;  Season 7 production art)

In the act directly precipitous to the Dominion War, the Federation mined the entrance to the wormhole (leading to the Gamma Quadrant) in 2373. This cut off access to the Gamma Quadrant from any Alpha Quadrant powers and prevented Dominion reinforcements from participating in the Dominion War. ()

The Borg 

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

Governments 
 Argrathi Authority
 Borg Collective (transwarp hub)
 Dominion

Planets 
 Argratha
 
 Dosi homeworld
 Ennis and Nol-Ennis homeworld
 Errikang VII
  (first)
  (second)
 Hunters' homeworld
 
 Kurill Prime (uncertain)
 Kylata II
 Meridian
 Parada II
 Parada IV
 Rakhar
 
 Stakoron II
 Teplan homeworld
 Wadi homeworld
 Yadera II
 Yadera Prime

Colonies and Outposts 
 Internment Camp 371
 New Bajor

Spatial landmarks 
 Chamra Vortex
 Obatta Cluster
 Jenkata Nebula
 Omarion Nebula
 Denkiri Arm
 Stars
 Idran
 M92
 Trialan sun

Related topics
 Gamma Quadrant species
 Gamma Quadrant star systems
 Unnamed Gamma Quadrant moons
 Unnamed Gamma Quadrant planets
 Unnamed Gamma Quadrant stars
 Unnamed Gamma Quadrant star system
 Unnamed Gamma Quadrant starships

Appendices

See also 
 Alpha Quadrant
 Beta Quadrant
 Delta Quadrant

Background information 
Early in the run of DS9, Ira Steven Behr commented "To me, the Gamma Quadrant should be the great unknown. If we ever get too close to any of these cultures, to me the mystery of the Gamma Quadrant has been solved. We have to be very careful with what goes on with the Gamma Quadrant". (Cinefantastique)

In response to inquiries as to why the Federation continued to visit the Gamma Quadrant, Ronald D. Moore stated
"The Dominion does not own the entire Gamma Quadrant. We had explored the GQ for two years before encountering the Dominion, so it's not as though the wormhole opens up in their living room. There are other races in the GQ that are not part of the Dominion and the Ferengi at least have established trade with some of them. When the Dominion told us to stay out of the GQ, it was as if China told the US to stay out of the . China is the big boy in this neck of the woods, and you better take their warning seriously, but at the same time we have trading partners and allies there and hey, freedom of the seas and all that." 

Nevertheless, the Gamma Quadrant was visited only minimally during the course of the seven season run, with appearances in that quadrant limited to DS9 Season 1's , , and ; DS9 Season 2's , , , , , , , and ; DS9 Season 3's , , , , and ; DS9 Season 4's , , , , , , and ; DS9 Season 5's , , , ; and then would not be visited again until two and a half years later, during DS9 Season 7's .

Apocrypha 
The exploration of the Gamma Quadrant resumed in 2376, with Elias Vaughn leading the , in the Mission Gamma miniseries.

The Gamma Quadrant was added to the galactic map in the "Victory is Life" expansion of Star Trek Online in June of 2018. With the Hur'q rampaging through Dominion space, the Gamma Quadrant map is a "battlezone", a sort of mini-campaign, that involves defending worlds from Hur'q attack and destroying Hur'q capital ships. After completing a certain number of objectives, the mini-campaign ends with the defense of the  of Empersa before the map resets.

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