An Alliance can refer to several organizations and ships.

Governments:

• Alliance of Free Planets
• Alliance to Restore the Republic (or Rebel Alliance)
• Galactic Federation of Free Alliances (or Galactic Alliance)

Non-Government Organizations:

• Alliance (Second Imperial Civil War)
• Corporate Alliance
• Smugglers' Alliance

Ships:

• Alliance (Imperious-class)
• Alliance (Mon Calamari Star Cruiser)

It can also refer to several out-of-universe products:

• Rebel Alliance Sourcebook
• Star Wars: The Old Republic: Fatal Alliance
• Star Wars: Lethal Alliance
• Star Wars: X-wing Alliance

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