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.

Out Of Time

Free
Thriller, Action
4.4★ 1000 ratings

As an MI6 spy in 1963, Atticus Wolfe should be enjoying everything the swinging sixties has to offer. But he’s not. That’s because Atticus Wolfe is from the 21st century.


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The Invisible Dimension

FEATURED FREE NEW RELEASE
Science Fiction, Humor
Published Nov. 7th, 2025

What happens when two halves of a planet were designed by an ancient god as a key for unlocking portals to unknown dimensions? Join three immortal aliens as they find out. The Invisible Dimension is a comedic sci-fi romp that bristles with absurdity.


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Oasis

Free
Science Fiction, Suspense
4.0★ 2500+ ratings

Theo is a resident of Oasis, the last habitable area on Earth. It’s meant to be a paradise, a place where we are all content. But some of aren’t.


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Wild Thing

Free
Science Fiction, Action
4.0★ 100+ ratings

In 2036, magic returned to a world that did not want it. Several years later, at the Institute for Paranormal Dysfunction, Sara is hunting an imaginary creature, unaware it is both real and far more dangerous than anyone could know.


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Town Secrets

Free
Science Fiction, Teen
4.2★ 1000+ ratings

As the child of a struggling single parent, Adam McTaggart never dreamed his life could get more exciting than one day becoming a mechanic- until a nearby community is mysteriously destroyed.


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Warlord Sky

Free
Steamy Romance, Science Fiction
4.5★ 750+ ratings

Qulpa, a Chamele warrior, lost everyone he loved in the brutal Succession Wars. After a horrific crash leaves him injured and unable to fly, will anything–or anyone–be able to reignite his passion?


Amazon

On Impulse

Free
Science Fiction, Action
4.6★ 100+ ratings

When the Department trained me to catch criminals, I never dreamed I’d become one. I was an agent until I shot my partner in self-defense, and they turned on me. Now, I’m an intergalactic fugitive.


Amazon

Peace Warrior

Free
Science Fiction, Action
4.3★ 1000+ ratings

It’s the mid-21st century when Sergeant First Class Grant Justice is killed during an ambush on an enemy tank column. Six hundred years later, his body is retrieved and reanimated.


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Before the Sky Broke

Free
Science Fiction, Novella
4.3★ 10+ ratings

Gas prices spike, power outages cripple, rumors spread of supply chain attacks, and militia recruitment signs hang in high schools. The world hasn’t ended yet. But the cracks are starting to show.


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Lawless

Free
Science Fiction
4.2★ 750+ ratings

Lark never thought escaping the rural prison known as San Judas was possible, until she learns that the guards outside the walls are disappearing, and the world as they know it is coming to an end.

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Neptune Crossing

Free
Science Fiction, Adventure
4.1★ 1000+ ratings

When John Bandicut falls into a cavern on Triton, his life changes irrevocably—and for an alien quarx, a million years of solitude abruptly comes to an end.


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On Distant Shores

Free
Science Fiction, Adventure
4.3★ 1000+ ratings

When Chief Warrant Officer Mike Duggins and his team are assigned to a DARPA black site, reality is changed instantly, leaving them in an unrecognizable world, stalked by draconic predators.


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Crimson Tempest

Free
Science Fiction, Adventure
4.3★ 2500+ ratings

Fifty-three years after it vanished, Earth’s only Super-Devastator warship, the ESS Crimson sends out a distress signal. Captain John Nathan Duggan is given a mission to find that missing ship.


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Under Falling Skies

Free
Science Fiction, Teen
4.3★ 300+ ratings

A chance encounter with a stranger from the other side of the galaxy threatens to derail Scout’s life. The entire galaxy awaits her, if she survives the next four days.


Amazon

Soldier of Fortune

Free
Science Fiction, Adventure
4.4★ 1000+ ratings

In the distant future, on the planet Fortune, a disgraced soldier, a pint-sized thief, and a draco with attitude take on assassins, spies, and mercs-for-hire in a long overdue fight for justice.


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Rescue on Gimhae

Free
Science Fiction, Adventure
4.4★ 200+ ratings

Sgt Seavers of the Orphan Corps is having a run of bad luck. After a fight, he is informed of his penance. To get back his chance at officer candidate training, he’ll do his best or die trying.


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