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.

Grounded

Free
Science Fiction, Teen
4.3★ 1000+ ratings

When my father falls ill, the doctor says a hospital outside the wall can heal him. A friend convinces me to go on rumspringa, but adventure quickly turns to horror.


Amazon

Timepiece

Free
Science Fiction, Historical
4.0★ 200+ ratings

It’s 1815, and Wellington’s outnumbered army stares across the field of Waterloo at Napoleon’s forces. Desperate to hold until reinforcements arrive, Wellington calls upon a race of monsters to help.

Amazon

Right Through Me

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

Biotech tycoon Noah Gallagher is a super-soldier with abilities that go far beyond human. When a vicious enemy bent on the ultimate revenge puts his murderous plan into play, Noah and Caro must battle for their lives…and their love…


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Dusk of Humanity

Free
Science Fiction, Suspense
4.3★ 200+ ratings

Dr. Egan never thought life after the apocalypse would be so dull. Until the day she finds an infected man in her operating room with symptoms she’s never seen before. And it’s spreading.


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The Rise of the River-Man

Free
Science Fiction, Novella
4.1★ 300+ ratings

Imagine a world filled with human-animal hybrids. They’re stronger than us. Faster. More deadly and hungry. Always hungry. Now, step inside the laboratory and witness their creation.

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Midnight Wings

Free
Science Fiction, Adventure
4.3★ 500+ ratings

In El’s fantasies, she pilots a fighter jet for the intergalactic fleet. In reality, she’s a mechanic whose social ranking keeps her as hired help to her stepmother. An exciting science fiction retelling of Cinderella.

Amazon

Spinward Fringe: Origins

Free
Science Fiction, Collection
4.4★ 5000+ ratings

In the distant future, one man’s mundane life takes a thrilling turn when he and his friends are thrown into a dangerous mission to acquire technology and knowledge for their nation.


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Ava’s New World

Free
Science Fiction, Novella
4.4★ 100+ ratings

Ava has a secret that could shift the balance in a world divided by wealth and technology. Although she’s inherited her father’s ingenuity for robotics and engineering, Ava has transcended her roots.

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The Survivors: Summer

Free
Science Fiction, Suspense
4.2★ 1000+ ratings

Humankind’s extinction event has come and gone. Sandy McDermott survived, but can she find a way to live in this bold new world without losing her humanity along the way?


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Take the Shilling

Free
Science Fiction, Action
4.1★ 200+ ratings

Tomas Neumann seeks escape from his backwater planet and his overbearing mother and needs a mentor. Enlisting in the Confederated Worlds military is his only opportunity.


Amazon

Rush

Free
Science Fiction, Teen
4.4★ 200+ ratings

After an accident, Miki Jones is pulled from her everyday life, trapped in an alternate reality game where she and a team of other teens battle deadly alien creatures bent on mankind’s destruction.


Amazon

Birth of a Star

Free
Science Fiction, Novella
4.3★ 30+ ratings

So when Aldrea’s father is taken prisoner by a deranged Radical agent on a deserted planet, she doesn’t think twice–she goes after them. But time is running out.


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Endpoint

Free
Science Fiction, Adventure
4.3★ 300+ ratings

A final shadow swallows the Sun and Earth, and in mere minutes, humanity is erased from the cosmos—all save one. When Ryan McBain regains consciousness, he is drifting alone in orbit.


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Sky Hunter

Free
Science Fiction, Adventure
4.1★ 1000+ ratings

Air Command pilot Nova Whiteside is assigned to a remote outpost to guard the construction of a new orbiter, Skyranch Twelve, against rebel sabotage.

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Close Liaisons

Free
Steamy Romance, Science Fiction
4.1★ 5000+ ratings

For college student Mia Stalis, the invaders—the beautiful, mysterious, vampiric Krinar—are only stories on the news. None of it concerns her until she catches Korum’s eye.


Amazon

Well of Furies

Free
Science Fiction, Adventure
4.2★ 1000+ ratings

The godlike Ulltrians waged war on all life among the stars. Long thought extinct, the Ulltrians have returned. Now all the Galaxy is in danger. Humanity faces extinction.


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