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.

Surviving Chaos

Free
Thriller, Action
4.1★ 750+ ratings

In the blink of an eye, an EMP attack wipes out the nation’s power and the world grinds to a stop. Surrounded by chaos, Cassandra Drews is torn between tending to the injured or escaping her seething ex.


Amazon

Day 115 on an Alien World

Free
Science Fiction, Adventure
4.2★ 500+ ratings

After a tarnished military record leaves her unable to find work on Earth, Margo is hunting for a fresh start. A colonizing mission on a new world creates the perfect opportunity—or so she thinks.

Amazon

Cul-De-Sac

Free
Science Fiction, Adventure
4.4★ 400+ ratings

Jacob Hines is thrust into a mysterious and strange walled community where secrets are kept and dangers lurk around every corner after being accused of the murder of his parents.


Amazon

Earthweeds

Free
Science Fiction
4.2★ 400+ ratings

In this post-apoc, alien invasion thriller, when humanity vanishes, the survivors must unravel the mystery while defending themselves against new creatures swarming the planet. The fight for Earth has begun!


Amazon

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.


Amazon

The Invisible Dimension

Free
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.


Amazon

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.


Amazon

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.


Amazon

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.


Amazon

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.


Amazon

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.


Amazon

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.

Amazon

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.


Amazon

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.


Amazon