The Ancients

Homeworld - Unkown
First Appeared - 'Frozen'
The race that built the Stargate system.

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The Asgard

Homeworld - Asgard homeworld
First Appeared - Thor's Chariot
One of Earth's most powerful allies, the ancient and benevolent Asgard have assumed the personae of Norse mythology on many protected worlds.

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The Goa'uld

Homeworld - P3X-888
First Appeared - "Stargate" the movie
One of our galaxy's dominant species, the Goa'uld are parasites that forcibly take human hosts -- and possess a thirst for power and worship.

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The Tok'ra

Homeworld - Unknown
First Appeared - In the Line of Duty
Though from the same species as the Goa'uld, the Tok'ra are a resistance movement who live in voluntary symbiosis with their human hosts.

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The Nox

Homeworld -
First Appeared - The Nox
Though they initially appear unadvanced, the forest-dwelling, pacifist Nox are one of the galaxy's oldest and most advanced races.

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The Jaffa

Homeworld - Various
First Appeared - "Stargate" the movie
Slaves of the Goa'uld, the Jaffa are humans from many different worlds, most of whom have been implanted with larval Goa'uld symbiotes.

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The Tollen

Homeworld - Tollana
First Appeared - Enigma
One of the most advanced races of humans encountered by the SGC, the arrogant Tollan became an ally of Earth.

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Replicators

Homeworld - Unknown
First Appeared - Nemesis
Technologically advanced "bugs," Replicators are capable of working together and assembling their individual blocks into whatever form they need.

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Unas

Homeworld - P3X-888
First Appeared - Thor's Hammer
The strong but unadvanced Unas were once the original hosts of the Goa'uld, and originate from the same homeworld.

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The Abydonians	The Bysra	Chulakians
The Argosians	The Cimmerians	Cartagians
The Fenri	Unity Crystals	Aschen
The Shavadai	The Primitive Cave Dwellers	Enkrans
The Touched	The Nasyans	Altairans
The Untouched	The Oannes	The Giant Aliens
The Residents	The Spirits	Edorans
The Salish Indians	The Badrosians	Vyans
Winged Insect Creatures	The Optricans	The Orbans
Eurondans	Furlings	Gadmeer
Hankans	Madronans	Orbanians
Simarkans	Taldor	Tobin