Avalon is the name of a planet in multiple works of science fiction.
- Poul Anderson's Dominic Flandry universe, for example his short story "A Knight of Ghosts and Shadows," in the collection Sir Dominick Flandry: The Last Knight of Terra
- Nancy Kress's novel Crossfire
- Colin Harvey's brilliant novel Winter Song
- Larry Niven's novel Destiny's Road, where the planet is also Tau Ceti 3
- Mack Reynolds's novels Planetary Agent X and Amazon Planet