Various known locations in the Alien Swarm universe.
- Main article: Allied Systems
The Allied Systems are the outermost member worlds of the Interstellar Alliance, and the hardest to protect and maintain.
- Main article: IAF
The Interstellar Armed Forces (IAF) is the military organization to which the marines belong.
- Main article: Interstellar Alliance
The Interstellar Alliance is made up of two separate political factions, the powerful Core Systems centered around Sol and made up of the founding worlds, and the far flung but more numerous colonies of the Allied Systems.
- Main article: SynTek
SynTek Megacorporation, Inc. provides most of the in game equipment used by the IAF to protect the Interstellar Alliance.
- Main article: Telic
- Main article: Other organizations
A list of mentioned organizations in the Alien Swarm universe which miss too much information to justify their own articles.
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