Top Free Science Fiction Kindle Books

Whether you enjoy futuristic, dystopian, apocalyptic, space opera, or other sci-fi delights, you’ll find great books among our top 100 free Kindle science fiction books.

Sub-Human

Free
Science Fiction, Action
4.1★ 2000+ ratings

When World War III strikes, Dr. Craig Emilson is sent to take out a powerful AI. He becomes the greatest hope for humanity. He must choose between himself or all mankind.


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Mind Secrets

Free
Science Fiction, Teen
4.2★ 500+ ratings

Waking up being hunted, Michael finds sanctuary with a group of telepaths who sense thoughts and emotions. To save his friends, he must confront his forgotten secrets.


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Al Clark

Free
Science Fiction, Adventure
4.3★ 2500+ ratings

Al Clark is on a quest that will take him places he could not have imagined, manage feats he would not have thought possible, and teach him the true meaning of friendship.


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Marked

Free
Science Fiction, Teen
4.3★ 1000+ ratings

In this dystopian romance, Ruby had barely started kindergarten when the world collapsed, but by now she’s over it. When things go sideways, will the long-forgotten past come back to claim its due?


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Transient

Free
Science Fiction
4.0★ 750+ ratings

In a dark and distant future, death is obsolete. But the fates of billions hang in the balance. When the axe falls, Jonas must choose between his family and his species.


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Taken

Free
Steamy Romance, Science Fiction
4.3★ 1000+ ratings

Jayne is a feisty human lawyer plucked from Earth by a beast of an alien captor, Rexitor. “All enemies of the Empire must die. But not her, she is mine to claim…”


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Legacy

Free
Science Fiction, Teen
4.2★ 300+ ratings

Willow Oak Watson is locked inside an experimental world. Fillion Nichols has never met the girl who haunts his dreams. A chilling secret forever binds their lives together.


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Forgotten

Free
Science Fiction, Supernatural
4.4★ 1000+ ratings

While struggling to regain her memory, Lena explores her extrasensory powers. As she tries to figure out who and what she is, she makes a frightening discovery.


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The Cartographer

Free
Science Fiction, Adventure
3.8★ 100+ ratings

After Nathan accidentally unlocks an ancient artifact, a chain of events is set in motion… one that threatens to tear at the very fabric of the universe, and to destroy Earth.


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Mind Machines

Free
Science Fiction
4.2★ 1000+ ratings

Plunged into a criminal underworld darker than anything he could’ve imagined, more-than-human Mike’s life-saving brainocytes might be the death of him.

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Under Falling Skies

Free
Science Fiction, Teen
4.2★ 100+ ratings

A chance encounter with a stranger from the other side of the galaxy threatens to derail Scout’s life. The entire galaxy awaits her, if she survives the next four days.


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Descent into the Void

Free
Science Fiction, Adventure
4.0★ 500+ ratings

Responsible for the development of the Union’s most secretive weapon system, Stiler and his ragtag crew of Marines have one chance to turn the tide of the war.


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The Running Game

Free
Science Fiction, Adventure
4.2★ 300+ ratings

War-torn London sets the stage for Rachel, a doctor with hidden telekinetic powers. With the help of dangerous and dubious allies, can she turn the game around and save herself?

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Mission: Flight To Mars

Free
Science Fiction, Action
3.9★ 750+ ratings

Bob Astor is a regular guy who has a keen curiosity and a willingness to help others in trouble and he gets himself into hot water along the way to saving the day.


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Moonchild

Free
Science Fiction, Teen
4.3★ 200+ ratings

Scarlett Moon has one goal: Survive. When her best friend is arrested and returned to the mines, Scarlett sets out on a mission to save her friend.


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The Kalis Experiments

Free
Science Fiction, Adventure
4.1★ 100+ ratings

Syrina, a Kalis master of disguise, embarks on a perilous mission in the steam-powered city of Fom where she learns of a machine that could end civilization a second time.


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