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.

Rift

Free
Science Fiction
4.2★ 2500+ ratings

As Sue is nearing Selection Day, she secretly hopes to be chosen, despite having to leave her mother and brother behind. But when she learns the secrets of the Covenant, Sue questions everything she has always taken for granted.

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Flash Gold

Free
Science Fiction, Novella
4.4★ 1000+ ratings

Fortune seekers and airship pirates are after eighteen-year-old Kali McAlister for the secret to flash gold, her late father’s alchemical masterpiece. When a sword-slinging stranger shows up, she’s sure he has ulterior motives.


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Activate

Free
Science Fiction, Suspense
4.1★ 300+ ratings

Years of calamities took humanity to the brink of extinction. Now, with the aid of a time capsule, the human race is once more populating the Earth, resurrecting technologies lost centuries earlier.


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She Dreams of Me

Free
Science Fiction
4.3★ 20+ ratings

Amanda lives in the Polis, an underground human colony that is thought to be the only surviving human society. To save her beloved city, Amanda’s secret must be revealed, endangering the lives of everyone she loves.


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Love in an Undead Age

Free
Science Fiction, Teen
4.3★ 200+ ratings

Some scars don’t heal. They fester. Haunted by a past she can’t escape and torn between loyalties that threaten to destroy her, Miranda discovers that trust can be fatal, and love might be worse.


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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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Cut

Free
Science Fiction, Suspense
4.2★ 1000+ ratings

I’ve reached my expiration date. Not that it matters. We’re all going to die. But truth comes with a price. Two rules carved in bone: Kill. Survive. Because the final wars were never meant to end.


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I Am John Titor

Free
Science Fiction, Mystery
4.0★ 200+ ratings

Idealistic filmmaker RJ is stuck shooting mundane reality shows when he longs to create documentaries that change the world. An internet legend who claims to time-travel could turn things around.


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Night of the Purple Moon

Free
Science Fiction, Teen
4.3★ 1000+ ratings

On a small Maine island, Abby Leigh helps her siblings survive in a world where germs attack human sex hormones, but all the while she has a ticking time bomb inside her – adolescence.


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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.


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The Harvesting

Free
Science Fiction
4.4★ 1000+ ratings

Layla Petrovich, a Smithsonian curator, is busy with her life in Washington D.C., when a pandemic sweeps across the globe. It is the end of everything. Then, the dead begin to rise.


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The Unusual Clients

Free
Science Fiction, Mystery, Collection
4.3★ 10+ ratings

In a city where the cops are on a mobster’s payroll, private investigator Charlie Madison stands in the gap. He takes the case of a wealthy young socialite, but things aren’t what they seem.


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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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Bypass Gemini

Free
Science Fiction, Adventure
4.4★ 1000+ 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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Nephilim

Free
Science Fiction, Novella
4.5★ 75+ ratings

Nephilim is a cybernetically enhanced super-soldier, created to protect and destroy. Protect the Olympias Conglomerate, the mega-corporation that owns them, and destroy its enemies– at any cost.


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First Strike

Free
Science Fiction, Action
4.3★ 2500+ 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. 

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