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.

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.


Amazon

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.


Amazon

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.


Amazon

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.


Amazon

Murder on the Intergalactic Highway

Free
Science Fiction, Mystery
4.1★ 200+ ratings

For Murdina, acceptance at the Academy means one last chance at her dream of becoming a diplomat for the Union of Free Worlds. For Shackleton, it represents his last chance at service.

Amazon

Galaxy of Heroes

Free
Science Fiction, Adventure
3.9★ 1000+ ratings

The lives of four space drifters intersect on a planet of hope as the most powerful war machine in the galaxy approaches, threatening to consume them all in a storm of metal and fire.


Amazon

Panic

Free
Horror, Science Fiction
3.9★ 1000+ ratings

Michael Evans is only in rural St. Davids to maintain a low profile after his time spent as a city cop ended in disaster. The town is perfect for him until the strange canisters fall from the sky.


Amazon

Wanderer’s Escape

Free
Science Fiction, Action
4.2★ 5000+ ratings

The Empire will kill Jess for stealing this ship… but they have to catch it first! Now Jess and the ancient self-aware ship are on the run, their freedom and their very existence on the line.

Amazon

Woman Beneath the Ice

Free
Science Fiction, Suspense
4.0★ 60+ ratings

Aboard a spaceship leaving Earth for the wild planet of Cerulean, Evita begins a desperate escape plan. But a nosy engineer and an explosion in the ship’s engine room have her fall into a deadly game for control of the new planet.


Amazon

Cyborg Awakenings

Free
Science Fiction, Romance, Novella
4.2★ 100+ ratings

Earth has been nearly destroyed by the Mesaarkans in revenge for a massacre on a distant colony by an Earth survey team. Cyborgs have been created by the thousands to fight this hundred year war.


Amazon

Crossing in Time

Free
Science Fiction
4.3★ 1000+ ratings

With humanity teetering on the edge, Iz is plunged deep into her past. With only hours to live, she must persuade a young man to set off a chain of events that will prevent the pandemic.

Amazon