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.

Of Donkeys, Gods, and Space Pirates

Free
Science Fiction, Humor
4.4★ 100+ ratings

Symbiont Harry, exiled from home, is imprisoned in the form of a donkey. When a galactic animal contest promises a fortune, the talking donkey starts to look like a potential winner.


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Nullform

Free
Fantasy
4.6★ 200+ ratings

In this world, everyone starts with no memory and no recollection of their past life. In this world, you’re under unrelenting supervision, and you’re assigned a number. You’re a volitional Nullform.


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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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Exodus

Free
Science Fiction
4.1★ 5000+ ratings

When mankind faces extinction, how can anyone survive? As mankind on Earth faces its final blow, the selected few set course for Aurora, more than 40 light years away.


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Apocalypse Awakening

Free
Science Fiction, Suspense
4.2★ 10+ ratings

Celebrated war hero Michael Conway is fighting on the front lines of the war and public chitchat when he’s abandoned in an empty, devastated city. It’s on him to discover what’s happened to the world.


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Watchers

Free
Science Fiction
4.2★ 500+ 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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Flight of the Old Wolf

Free
Science Fiction, Action
4.2★ 50+ ratings

Deranged by centuries in thrall to obscene alien gods, the Golgothan Empire is ready to make its big move. And a meeting of the star-nations is a perfect way to get all their enemies in one place.


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The Syndicate

Free
Science Fiction, Teen
4.5★ 500+ ratings

As a Runner for the underground syndicate that controls the timewaves, Stassi’s job is to seamlessly slip through the past to acquire relics once lost in history.


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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 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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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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Forbidden the Stars

Free
Science Fiction
4.0★ 1000+ 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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Soul Forged

Free
Romance, Science Fiction
4.4★ 50+ ratings

Ori agreed to travel with aliens who need women, not to abduction, life/death battles, & escaping with an arrogant man. With a bounty on her head, happily-ever-after isn’t all flowers & pink sunshine.


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Edge of the Breach

Free
Science Fiction
4.4★ 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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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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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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