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.

The Trilisk Ruins

Free
Science Fiction
4.2★ 5000+ ratings

Telisa refuses to join the government because of its hard-handed policies restricting civilian investigation and trade of alien artifacts, despite her father, a Space Force captain.

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Bypass Gemini

Free
Science Fiction, Adventure
4.4★ 2000+ ratings

A package gets Trevor “Lex” Alexander mixed up with mobsters, a megacorp, and a mad scientist. Now his life depends on learning what their plans are and how he can stop them.

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Tentacles And Teeth

Free
Science Fiction, Adventure
4.3★ 750+ ratings

The sudden invasion of monsters left the world shattered. Now, armed with her bow and blade, Askari sets off alone, to learn not only about the world she lives in but also question what she believes about herself.

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The Becoming

Free
Science Fiction, Action
4.2★ 1000+ ratings

The Michaluk Virus is loose. As the virus transforms the population into homicidal cannibals, three people band together against the oncoming crush of death and terror.


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I AM MAN

Free
Science Fiction, Christian
4.3★ 75+ ratings

Fresh from the factory, X5 agrees to help an exiled princess escape from prison. He believes he’ll carry out a simple mission but then the two of them discover a scheme that threatens to unravel the very fabric of the Valetian Empire.


Amazon

Rogue Stars Series

Free
Science Fiction, Collection
4.3★ 1500+ ratings

Jump into seven full-length novels exploring the last great frontier. Rogue Stars has alien invasions, artificial intelligence, galactic intrigue, and heroes that will defy orders to do what is right.

Amazon

First Strike

Free
Science Fiction, Action
4.3★ 4000+ ratings

When war comes, it is sudden and brutal. Second Lieutenant Michael Sheridan finds himself thrust into a desperate conflict that he and the untried soldiers under his command are not ready for. 

Amazon

Unmasked

Free
Science Fiction, Action
4.2★ 100+ ratings

Veterinarian Milly Smith works in a zoo surrounded by resurrected Ice Age megafauna. When a body is discovered on her watch, can a scientist protect her charge from extinction?


Amazon

Panglor

Free
Science Fiction, Adventure
4.1★ 750+ ratings

Wrongly discredited as a space pilot, Panglor Balef is doomed to die in space, if sheer luck doesn’t bring him through. But luck has never been in Panglor’s cards.


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Tesla

Free
Science Fiction, Suspense
3.9★ 200+ ratings

After recovering space-age technology amidst the fallout of an assassination, Special Forces soldier Darren Mathews obtains Earth-shattering documents. But for every ancient secret learned, he will have to pay a price.

Amazon

Alien Species Intervention

Free
Science Fiction, Suspense
4.0★ 1000+ ratings

After years of enslavement, Netty flees into the night from her husband, traveling back to her parents’ farm, where she rescues an enigmatic and damaged creature named “Baby” with whom she falls in love.


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Traveler in The Dark

Free
Science Fiction
4.0★ 600+ ratings

Sixteen hundred years ago, they fled Earth. Now their long journey may finally be at an end. But they must make a choice. Sacrifice another species or accept their own extinction. And time is running out.

Amazon

Any Job Will Do

Free
Science Fiction
4.1★ 750+ ratings

Jax’s parents fought for the losing side of the unification wars. Now he takes the jobs he can get; smuggling, bounty hunting, hauling cargo. Will Jax and his friends finish the latest job without getting caught, or killed?


Amazon

Grail Protocol

Free
Science Fiction, Thriller
4.2★ 50+ ratings

What happens when an old man suddenly returns to youthful vigor while his wife remains old? Or when a grandmother is suddenly younger than her grandchild? Immortality comes with a price tag.


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We the People

Free
Science Fiction
4.1★ 200+ ratings

In the late 21st century, a neurotechnology called Bridge changed the world. A new world order developed. Bridged Children grew smarter, faster, and stronger than Adults and began a war for equality.

Amazon

Veil of Mystery

Free
Science Fiction, Suspense, Novella
4.2★ 300+ ratings

When the lower orbital satellites stop working, everyone is plunged into an apocalyptic world. Isolated in the small Texas town of Alpine, Keme Lopez needs to prepare his family. The first few days will determine who lives or who dies.


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