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.

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.


Amazon

Flicker

Free
Science Fiction, Suspense
4.2★ 750+ ratings

To Earthen tourists, Ember is a strange and unusually talented future-teller who likes solitude. To her people, Ember is rebellious and doesn’t belong. She sees the future, and the empire knows it.


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Star Mage Quest

Free
Science Fiction, Adventure
4.2★ 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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Scythian Dawn

Free
Science Fiction, Adventure
4.4★ 500+ ratings

Alien overlords keep Earth trapped in a perpetual Dark Age. One barbarian war band has the will to fight back.

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The Kaiyos Lex: Imperium

Free
Science Fiction, Teen
4.5★ 300+ 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.


Amazon

Angie and the Farmer

Free
Romance, Science Fiction, Historical
4.2★ 500+ ratings

How did an iPhone sold in Missouri in 2014 wind up in a grave in Oregon that had been undisturbed for over ninety years? How can Angie convince Jed that she is telling the truth?


Amazon

Knot in Time

Free
Science Fiction, Adventure
4.2★ 500+ ratings

I work for a group called the Keepers, the custodians of time. Time is a mess, and it needs all the custodians it can get. That is why the Keepers selected me, a nineteen-year-old high school dropout.


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Broken Realms

Free
Science Fiction, Adventure
4.1★ 400+ ratings

Some lives are bigger than one reality. The day Mara Lantern meets herself, her life gets bigger. And when she meets her brother from an alternate universe, it becomes more complicated.


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Project Mind River

Free
Science Fiction, Action
4.3★ 100+ ratings

Tara invented a sentient AI, but it was lost in a fire. Now, accidental deaths are happening throughout the country. She needs to find out what’s happening before it’s too late.

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The Stars Beyond the Mesa

Free
Science Fiction, Adventure
4.1★ 100+ ratings

In Northern Arizona is a research facility that never opens its doors. Stranded there for the summer with her family, sixteen-year-old Katy is planning her escape. Then the incident happens.


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Steel Guardian

Free
Science Fiction
4.4★ 1000+ ratings

Machines turn against humans and the AI Uprising destroys society. When CleanerBot Block discovers a human infant, his surprise attachment to the girl compels him to protect her.


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Paax

Free
Steamy Romance, Science Fiction
4.0★ 2000+ ratings

The situation is dangerous for a hardened warrior, let alone a soft Human female without fangs or claws to defend herself. Sending her back to Earth is the only choice.

Amazon

Compound 26

Free
Science Fiction, Suspense
4.6★ 1000+ ratings

In a society ruled by sanctions and curfews, Dr. Meghan Forester emerges as the youngest and most promising scientist to join the fight against Makanza—the deadly virus that’s ravaged the world.


Amazon

The Watchers of Eden

Free
Science Fiction, Teen
4.5★ 1000+ ratings

On the day of the Duty Call, Cyra’s world turns upside down when she is assigned to Eden. Away from everything she knows, Cyra discovers she has a special power.

Amazon

The Undoing

Free
Science Fiction, Teen
4.4★ 75+ ratings

In a chilling near-future world, a totalitarian regime ruthlessly controls every aspect of citizens’ lives. But when Rebecca’s brother dies from a virus sweeping the city, she inherits a deadly secret.


Amazon

Lying in Ruins

Free
Romance, Science Fiction
4.2★ 100+ ratings

After society’s collapse, when Charity’s path crosses with a notorious mercenary group, she is faced with a less than stellar choice – join the sexy Ruin in a mockery of teamwork or waste her valuable time shaking him loose.


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