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.

Ure Infectus

Free
Science Fiction, Action
4.4★ 300+ ratings

Acting together in a tenuous alliance, Jericho and Masozi follow a trail of corruption across the Virgin Star System and discover something that will forever change them.

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Faring Soul

Free
Science Fiction, Romance
4.3★ 100+ ratings

Rumors emerge that Catherine has been seen in Federation space, so no one pays attention to the reticent navigator called Bedivere X who pilots her ship better than she does.


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The Hunted

Free
Science Fiction, Thriller
4.2★ 1000+ ratings

Joule and Cage Mazur feel like prisoners in their home. With monsters stalking the streets, their family’s only protection is bolting the door tight and hoping the locks hold.


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Exile

Free
Science Fiction, Action
4.5★ 1000+ ratings

Vice Admiral Isaac Gallant is the heir apparent to the dictator of the Confederacy of Humanity. Unwilling to let his mother’s tyranny stand, he joins the rebellion.


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Coronado Dreaming

Free
Science Fiction, Adventure
4.1★ 150+ ratings

Soon after two soul-mates meet, Greg finds himself in the strange, dreamlike world of a coma, a bizarre quantum multi-verse that blends time and distance, love and destiny.


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Outback Outbreak

Free
Horror, Science Fiction, Suspense
4.3★ 1000+ ratings

The outbreak changed everything, but there are some bonds even the undead can’t break. It’s been years since Pete Guinn last saw his sister and now she’s back.


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The Defectors

Free
Science Fiction
4.2★ 600+ ratings

On her mission to rescue her best friend Greyson, twenty-year-old Haven Allis will discover a revolution in motion and be forced to question everything she believes.


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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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