The Alliance is an independent faction working in and around the Koprulu Sector. Although it is primarily a terran organization, some protoss can be found within its ranks as well; and indeed, it maintains links with the protoss government.
During the Great War, the protoss struck an "uneasy alliance" with Raynor's Raiders, the forerunner or beginning of the Alliance. The Conclave knew of its existence and would maintain some relations with it.
- General Jim Raynor
- Major Berry
- Commander Haley
- Captain Julian Byrne
- Lieutenant Mari Suzek
- Specialist Kare Vaessen
- Corporal Kurtz
- Private Dennis Wiker
- The Alliance shares some similarities with the Umojan Protectorate considering that the Protectorate seeks a truce with the protoss.
- The Alliance may be based on the Alliance of Blizzard's Warcraft series. The Alliance is one of the two main factions in Warcraft, created in light of the threat of the Horde, which served as a distinct antagonist in the early RTS games. StarCraft's Alliance parallels this, the protoss and terrans facing the universal threat of the zerg.