A Federation is a government body structured around a system of federalism.
In Gundam, Federation may refer to:
- The Earth Federation, the primary governing body of the Earth Sphere in the Universal Century
- The Earth Federation Forces, the armed services of the Earth Federation
- The Earth Federation (Origin) as represented in Mobile Suit Gundam: The Origin
- The United Colonies Federation, created by the nation colonies in the Future Century timeline
- The Mars Federation, the post-AC governing body of Mars in the new Mars Century timeline
- The Atlantic Federation, the most powerful member of Earth Alliance in the Cosmic Era timeline
- The Eurasian Federation, another prominent member of the Earth Alliance
- The Earth Sphere Federation, a political body formed in the Anno Domini timeline
- The Earth Sphere Federation Forces, the official military of the Earth Sphere Federation
- The Earth Federation of the Advanced Generation timeline
- The Oceanian Federation, an economic bloc representing southeast Asia in the Post Disaster timeline