A
- Absolution Gap by Alastair Reynolds
- Accelerando by Charles Stross
- Acidity by Nadeem F. Paracha
- Across the Universe by Beth Revis
- Adulthood Rites, Book Two of Xenogenesis Series by Octavia Butler
- After Doomsday by Poul Anderson
- The Age of the Pussyfoot, by Frederik Pohl
- Air by Geoff Ryman
- An Age by Brian Aldiss
- Alas, Babylon by Pat Frank
- Alastor Cluster series by Jack Vance
- namely, Trullion: Alastor 2262, Marune: Alastor 933, and Wyst: Alastor 1716
- The Alejandra Variations by Paul Cook
- The Algebraist by Iain M. Banks
- Alien Tongue by Stephen Leigh, Essay by Rudy Rucker
- Ancient Echoes by Robert Holdstock
- Andromeda by Ivan Efremov
- The Andromeda Strain by Michael Crichton
- Andymon by Angela and Karlheinz Steinmüller
- Anima by Marie Buchanan
- Animorphs by K. A. Applegate
- Annals of the Twenty-Ninth Century by Andrew Blair
- Anthem by Ayn Rand
- Anthony Villiers series by Alexei Panshin
- namely, Star Well, The Thurb Revolution, and Masque World
- Ares Express by Ian McDonald
- The Artist of the Beautiful by Nathaniel Hawthorne
- As the Green Star Rises by Lin Carter
- Ascending by James Alan Gardner
- Asgard series by Brian Stableford
- namely, Asgard's Secret, Asgard's Conquerors, and Asgard's Heart
- The Atrocity Exhibition by J.G. Ballard
- Autumn Angels by Arthur Byron Cover
- Autour de la Lune (also known as Around the Moon and 'Round the Moon) by Jules Verne
- Awakeners series by Sheri S. Tepper
- namely, Northshore and Southshore
Read more about this topic: List Of Science Fiction Novels