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 200 free Kindle science fiction books.

ARISEN: Last Stand

Free
Science Fiction, Action
4.6★ 750+ ratings

One platoon of legendary Rangers. An isolated combat outpost in the Spin Ghar mountains. 150 Taliban survivors armed with Tier-1 weapons. And all the rampaging dead guys in central Asia.


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Lake of Sins: Escape

Free
Science Fiction, Teen
4.2★ 1000+ ratings

Every year after harvest, the weakest are removed from the encampment. None of them are ever seen or heard from again. Trinity escapes into the forest, but she’s hunted from land and sea by predators.


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Sub-Human

Free
Science Fiction, Action
4.1★ 2500+ 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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Altered Genes

Free
Thriller, Science Fiction
4.4★ 1000+ ratings

After Professor Simmons learns of a genetic threat unlike anything the world has ever seen, he, Dr. Ling, and an odd group of survivors find themselves on the run as civilization collapses around them.


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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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Broken Skies

Free
Science Fiction, Teen
4.2★ 1000+ ratings

Jax will do anything to save her twin . . . even team up with a teenage alien left behind by the same ship that took her brother. She agrees to work with the alien, but it isn’t that easy.

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Into the Dark

Free
Science Fiction, Adventure
4.3★ 200+ ratings

This dark universe offers a game of cat and mouse through the galaxy with twists and turns at every solar system. Lost alien civilizations, six-limbed insectoid warriors, plasma rifles, and more!

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Skyline

Free
Science Fiction, Teen
4.3★ 10+ ratings

Aurelie Bay and her family are loyal to Skyline and the corporation that has saved humanity from the apocalypse. Skyline is home. Skyline is family. Home is where the heart is. Until it isn’t.


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The Legacy Human

Free
Science Fiction, Action
4.2★ 1000+ ratings

Elijah Brighton wants to become an ascender. But he is a legacy human, preserved and cherished for his unaltered genetic code. Soon, the ascenders and the legacies they keep start to unravel.


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Ash

Free
Science Fiction, Novella
4.3★ 500+ ratings

Facing the zombie apocalypse in a wheelchair might prove a challenge to others. For thirteen-year-old Ash, it’s just another fight for her life.


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Rath’s Deception

Free
Science Fiction, Suspense
4.4★ 1000+ ratings

On the cut-throat streets of Tarkis, orphaned teens like Rath end up jailed … or dead. So when the shadowy Janus Group offers Rath a chance to earn riches beyond his wildest dreams, he seizes it.


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Surviving Chaos

Free
Thriller, Action
4.1★ 750+ ratings

In the blink of an eye, an EMP attack wipes out the nation’s power and the world grinds to a stop. Surrounded by chaos, Cassandra Drews is torn between tending to the injured or escaping her seething ex.


Amazon

Day 115 on an Alien World

Free
Science Fiction, Adventure
4.2★ 500+ ratings

After a tarnished military record leaves her unable to find work on Earth, Margo is hunting for a fresh start. A colonizing mission on a new world creates the perfect opportunity—or so she thinks.

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Cul-De-Sac

Free
Science Fiction, Adventure
4.4★ 400+ ratings

Jacob Hines is thrust into a mysterious and strange walled community where secrets are kept and dangers lurk around every corner after being accused of the murder of his parents.


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Hyde Park

FEATURED FREE NEW RELEASE
Science Fiction, Horror, Teen
Published Oct. 6th, 2025

After a group of teens gains early access to a high-tech theme park based on a beloved book series, Max and his new friends discover the park’s thrilling attractions conceal a deadly hunt by the very characters they once admired.

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Earthweeds

Free
Science Fiction
4.2★ 400+ ratings

In this post-apoc, alien invasion thriller, when humanity vanishes, the survivors must unravel the mystery while defending themselves against new creatures swarming the planet. The fight for Earth has begun!


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