Galaxy Garrison (銀河警備軍 Ginga keibi-gun ) is the headquarters of the Galaxy Alliance.
Armored Fleet DaiRugger XV continuity
The Galaxy Garrison originated from Armored Fleet DaiRugger XV, which was later adapted in the Vehicle Force portion of Voltron: Defender of the Universe. It is one of the few elements taken from DaiRugger XV that has been a constant in most Voltron continuities.
Voltron: Defender of the Universe cartoon continuity
Garrison Headquarters is the administrative center of the Galaxy Alliance located on Earth. The sprawling complex overlooking a bay by the sea. After the first defeat of Lotor, it continued to serve as the command center of the Galaxy Alliance.
The buildings contain offices for the military leaders of the Alliance and their staff. At least one entrance can be accessed via an underground parking garage. 
Voltron: The Third Dimension cartoon continuity
Five years after the original series, the headquarters is under the leadership of the cyborg Amalgamus and a reformed King Zarkon.
Voltron Force cartoon continuity
Voltron: Legendary Defender continuity
- Main article: Galaxy Garrison (Legendary Defender)
The Galaxy Garrison is a school where students learn about space travel.
- Galaxy Garrison's main building is called the Sky Dome.
- In the Devil's Due continuity there is a governing body called the Galactic Union that sent the five space explorers to Arus. It is likely Galaxy Garrison with a different name, since it's stated to be Earth-based.