- ... And Now You Don't (short story by Isaac Asimov published 1949)
- Action Replay (short story by Richard Quarrie published 1981)
- The Adaptive Ultimate (novel by Stanley G Weinbaum published 1935)
- After Earth (fan fiction by Johnny Pez published Year)
- Air Apparent (novel by Piers Anthony published 2007)
- Alien (novel by Alan Dean Foster published 1979)
- Alien 3 (novel by Alan Dean Foster published 2014)
- Aliens (novel by Alan Dean Foster published 1986)
- All The Traps Of Earth (collection by Clifford Simak published 1964)
- Amanda Morgan (novella by Gordon R Dickson published 1979)
- Apple (novella by Anne McCaffrey published 1969)
- Army Of Darkness (novel by Hugh Walker published 1979)
- The Art Of Alliance (short story by Robert Asprin published 1983)
- Asimovs Mysteries (collection by Isaac Asimov published 1968)
- Assassins Of Air (short story by George Zebrowski published 1973)
- Away And Beyond (novel by A E van Vogt published Year)