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.

Displaced

FEATURED FREE BOOK
Science Fiction, Teen
4.3★ 75+ ratings

When Bea Cooper is unexpectedly transported to another place and time, it will take everything in her power to find a way back home, especially with an evil adversary trying to stop her from ever returning.

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Colony One

Free
Science Fiction, Adventure
4.2★ 1000+ ratings

At a glance, Elderon seems to be a utopia. As Maggie realizes that Elderon is not what it seems, she’ll go undercover and learn a truth that could put her life in jeopardy.


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Alexandra Forever: 2291

Free
Science Fiction, Action
3.8★ 40+ ratings

A red dwarf star system barrels toward the Milky Way Galaxy. An SOS from a long-lost starship might be the only lead. Post Office Marshal Alexandra is conscripted to serve.


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The Kaiyos Lex: Imperium

Free
Science Fiction, Teen
4.6★ 100+ ratings

Betrayed by his leaders and sent to die defending a distant planet, Praetor Gaius Aurelius Marcellus finds his most ruthless adversaries are not a bunch of genocidal aliens.


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The Adventures of Wil Calder

Free
Science Fiction, Adventure
4.4★ 1500+ ratings

With a crew of misfits from across the Galactic Commonwealth, Wil takes a job that requires breaking into a space station. An untested crew. A heist. What could go wrong?


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Call of Courage

Free
Science Fiction, Collection
4.2★ 750+ ratings

Some are called by duty. Some are called by adventure. All answer the call of courage. Jump into seven full-length novels exploring the limits of space, science, and courage.


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Star Mage Quest

Free
Fantasy, Science Fiction, Action
4.3★ 500+ ratings

Carina Lin is a slum brat turned space mercenary with a twist. She’s also a mage, and she’s about to risk everything. Her merc band accepts what is surely a suicide mission.


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Sim-Verse: 6 Book Series

Free
Science Fiction, Action
4.2★ 75+ ratings

What price would you pay to have it all? What would you be willing to forget? Astro-miner Taven Smith finds himself lost in a dizzying maze of computer-generated simulations.


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Phantom Echo

Free
Thriller, Science Fiction
4.1★ 300+ ratings

Detective Nathan Miller suspects something sinister when the body of a college student is dumped in an alley far from campus. He’s forced to use allies who might be enemies.


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The Navigator

Free
Science Fiction, Action
4.3★ 1000+ ratings

Earth has changed. The world collapsed after the meteor impacts when fire rained down from the skies, instantly vaporizing millions. The survivors are facing a new problem.


Amazon

Wild Child

Free
Science Fiction, Suspense
4.1★ 500+ ratings

When Briana challenges Kyle to a swim, she’s injured in a horrific accident, but she discovers a mysterious drug-like substance in an underwater cave that saves her life.


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One If

Free
Science Fiction, Teen
4.2★ 100+ ratings

When Parker Kittredge slips and plunges 18 stories to the street, she awakens on a completely different planet, one destroyed by climate change and locked in a civil war.


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Between Mountain and Sea

Free
Science Fiction, Adventure
4.4★ 1000+ ratings

A descendant of one of the Founding Families who left a dying Earth and now rule New Eden, Mei will discover secrets that will forever change her own destiny.


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The Ancient Gate

Free
Science Fiction
3.9★ 10+ ratings

Desa and Anna must leave their comfortable lives to embark on a journey across dimensions where the two will face an enemy that threatens to destroy both of their worlds.


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Dragon’s Covenant

Free
Science Fiction, Adventure
4.3★ 300+ ratings

The Warlord has always eluded him, so when Talon Rift learns that the Warlord might have help from inside the Alliance government, he vows that he will stop at nothing to bring them to justice.


Amazon

28 Days

Free
Science Fiction
3.8★ 40+ ratings

Emma Cartwright races against time to find work in a society where compliance is mandatory and freedom is scarce. When her son Jack is arrested, Emma has to take drastic measures.


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