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.

Chaos Zone

Free
Science Fiction
4.2★ 100+ ratings

When Sloane sets her sights on a bounty with a reward that will solve her problems, the Commander of the Galactic Fleet shows up in pursuit of the same man. Tangled in a web of galactic politics, she won’t let her prize go.

Amazon

Port State

Free
Science Fiction, Novella
4.1★ 100+ ratings

When it comes to a sufficiently advanced technology, we are so conditioned by what we see at the movies that the real thing no longer seems magical. And unfortunately, that’s exactly what happens.


Amazon

Maelstorm

Free
Science Fiction, Adventure
4.1★ 500+ ratings

A hundred years from now, when selection day comes around, Gideon Rayne is entrusted with a miraculous suit of high-tech armor and put on a collision course with forces darker than he never knew existed.

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Gunslinger to the Stars

Free
Science Fiction, Action
4.2★ 400+ ratings

The name’s Sam Kletchka. Perhaps you’ve heard of me: captain of the Star Runner, military contractor for Earthfleet, and interstellar privateer. But before all that, I was a freelance gun for hire.


Amazon

Archangel Down

Free
Science Fiction
4.1★ 2500+ ratings

A military officer from the colonies and a civilian from Old Earth, they couldn’t have less in common. But they have to work together to save the lives of millions–and their own.


Amazon

Dawn of Rebellion

Free
Science Fiction, Teen
4.2★ 200+ ratings

Criminals are sent to the colonies to work as slaves. It’s a savage place, especially for a teenage girl from the wrong side of London. They’ve taken Dawn Nolan’s sister. She might die trying, but Dawn is going to get her back.

Amazon

Space Colony One: Books 1-3

Free
Science Fiction
4.3★ 2500+ ratings

A new planet is not the paradise the scientists predicted. With alien predators lurking and stowaway saboteurs, Ethan must fight to preserve the last hope of humankind.


Amazon

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.

Amazon

Displaced

FEATURED FREE BOOK
Science Fiction, Teen
4.3★ 100+ 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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Blackwing

Free
Science Fiction
4.2★ 200+ ratings

Is Socrates Blackwing’s magic stronger than the technology of 2070? And what will this wizard, warrior, and bounty hunter do when confronted with one of his own kind?

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The Change

Free
Science Fiction, Romance
4.1★ 1000+ ratings

Everything depends on Candice. Is she strong enough to rescue her childhood sweetheart from the games? The competition is fierce, and even the winners end up damaged. The apocalypse made sure of that.


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Freedom Legends

Free
Science Fiction, Action
4.2★ 1000+ ratings

For five hundred generations, humanity has been enslaved—addicted to a drug engineered to keep us docile under alien rule. But now, a mysterious virus is spreading hope.


Amazon

Whispers in Autumn

Free
Science Fiction, Teen
4.3★ 750+ ratings

In 2015, a race of alien Others conquered Earth. They enslaved humanity not by force, but through aggressive mind control that turned people into contented robots. Except Althea isn’t content at all.


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A Hero

Free
Science Fiction, Action
4.3★ 400+ ratings

Rayford Tyvos Jackson once dreamed of a stable life for his family, but when alien invaders destroy everything he loves, grief turns to insatiable vengeance.


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The Keepers

Free
Science Fiction, Teen
4.0★ 100+ ratings

After young Connor is gifted with superhuman abilities, her life changes. When she learns of others like her, she sets out on a path to discover her true origin. But are the powers a gift or a curse?


Amazon

Mercury’s Shadow

Free
Science Fiction, Action
4.3★ 100+ ratings

Imogen “Chim” Esper is thrust into the center of an interplanetary conflict when a cruel and indifferent corporation tears her family apart. She has no choice but to run.

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