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.

Negation Force

Free
Science Fiction, Action
4.3★ 2500+ ratings

After Atlantis is attacked, Sergeant Eric McKinney is determined to fight back and find out why the Vraxar have come. The answers are more shocking than anyone could imagine.


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The Solid-State Shuffle

Free
Science Fiction, Suspense
4.1★ 750+ ratings

Thrust into a high-stakes game of subterfuge and deception, Isa and her crew must scramble to unravel the mystery of what it is they stole while forces move against them.


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Watchers

Free
Science Fiction
4.1★ 300+ ratings

When two friends help a mysterious woman who holds a secret that defies all we know about human evolution, they are plunged into a nightmarish race across the globe to recover a relic so ancient it’s fallen into legend
.

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War Begins

Free
Science Fiction, Adventure
4.2★ 500+ ratings

An ancient race left a gift inside Diana’s mind, and it will now rise. The greatest enemy the galaxy has ever known is here. The war will begin.


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Star Nomad

Free
Science Fiction, Adventure
4.4★ 5000+ ratings

Alisa has more problems than she can count, but she can’t let cyborgs, savages, or ancient malfunctioning ships stand in her way. If she does, she’ll never see her daughter again.

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Breakers: Books 1-3

Free
Science Fiction
4.4★ 7500+ ratings

In the Breakers series, humanity faces not one apocalypse, but two: first a lethal pandemic, then a war against those who made the virus.


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The Eye of the Gods

Free
Science Fiction, Adventure
4.2★ 400+ ratings

Vivian Bond and Special Commander Jake Trace are thrown together in a fight for the Milky Way and beyond as an ancient power rises once more.


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Tier 1

Free
Science Fiction, Teen
4.1★ 200+ ratings

A virus nearly wiped out the human race. In order to survive, people are segregated into three tiers. Her genetics hold the keys to saving humanity…all she has to do is sacrifice everything.


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When You Had Power

Free
Science Fiction, Suspense
4.1★ 500+ ratings

An unscheduled power outage reveals that something isn’t right on Power Island One, but every step power engineer Lucía Ramirez takes to solve it, someone else gets there first—and they’re determined to make her unsee what she’s seen. 


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Forbidden the Stars

Free
Science Fiction
4.0★ 2000+ ratings

An expatriate seizes an opportunity to wrest control of outer space. The secret to faster-than-light speed is up for grabs, and the race for interstellar space begins!


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Fade to Blue

Free
Science Fiction, Thriller
4.1★ 100 ratings

Biotech researcher Sarah Brenalen is frustrated by the dismissal of her controversial theory, so she secretly injects lab mice with experimental Alzheimer’s drugs. Her experiment goes horribly wrong.

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Ashes of the Fall

Free
Science Fiction, Adventure
3.9★ 1000+ ratings

Con man Luke Stokes artfully navigates the crumbling remnants of North America. Sometimes the fall isn’t always the end. Sometimes, it’s only the beginning.


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Edge of the Breach

Free
Science Fiction
4.5★ 200+ ratings

We all become monsters at the edge of the breach. In a post-apocalyptic world where season of birth determines power, interrealm war beckons two lost and fated souls.


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The Rowan Tree

Free
Fiction, Literary
3.9★ 2500+ ratings

Reaching from the 1960s into humanity’s global future, an international cast of characters personifies the catalytic role of love and sex in political change.


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Run from Ruin

Free
Science Fiction, Thriller
4.1★ 500+ ratings

They’re not undead; they’re just angry…The DataMind meditation app revolutionized the world, making people smarter, happier, and more productive. But a programming glitch had some side effects.


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Soldier of Fortune

Free
Science Fiction, Adventure
4.5★ 1500+ ratings

Wrongly convicted of treason, Colonel Gideon Quinn, with his pet draco Elvis, boards an airship bound for Nike City in search of revenge. And justice. But mostly revenge.


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