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.

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.

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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.


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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.


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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

Dhata Mays

Free
Science Fiction, Mystery
4.0★ 100+ ratings

After a devastating war forced humans to rely on synths for survival, the two have learned to coexist peacefully. Until now. And detective Dhata Mays must find a way to protect them all.

Amazon

Death by Decent Society

Free
Science Fiction, Action
4.2★ 100+ ratings

This is the future we should have seen coming. A world without governments or nations, without any law above the greed of the rich. As the outrage of the people roars and some dream of revolution, the guns of the elite roar back.

Amazon

The Farthest Star

Free
Science Fiction, Adventure
3.9★ 750+ ratings

Given a mission by humanity’s last digital remnants, intelligent machine Gamma must traverse Starship’s vast, dangerous bulk in search of a way to preserve Starship’s original purpose.

Amazon

Time Rocks

Free
Science Fiction, Adventure
3.9★ 400+ ratings

An archaeological dig at Stonehenge turns into a nightmare for young Jack Shire when he is blasted into a terrifying prehistoric world, simultaneously unveiling a deadly, 21st century secret.


Amazon

Oversight

Free
Science Fiction, Teen
4.2★ 100+ ratings

Seventeen-year-old Zelly is a self-proclaimed computer geek. She’s also a leader of Soul Identity, a group that promises to pass people’s fortunes and memories on to their future selves.


Amazon

Dinosaur Lake

Free
Science Fiction, Thriller
4.3★ 2500+ ratings

An ancient predator has been reborn in the caves beneath Crater Lake… and it’s hungry. Chief Park Ranger Henry Shore must not only protect his park and his people from the monster but somehow find and destroy it.

Amazon

A Dead Ship in the Deep Black

Free
Science Fiction, Adventure
4.4★ 200+ ratings

Tink is used to a life of odd jobs and even odder crewmates, working as the engineer and all-around fixer on the cargo ship Lyra. But when the ship makes a stop, things go sideways in a cosmic way.


Amazon

The Mason Timeline Series

Free
Science Fiction, Adventure
4.0★ 40+ ratings

Alfredo Jaramillo was just another foster child with a temper. No one expected him to gain admission to Warner University, the world’s only time traveler training facility.


Amazon

Day of the Devourer

Free
Science Fiction, Adventure
4.3★ 100+ ratings

Rej Antares, a disgraced former galactic agent, has landed in prison on a remote third-world planet. Now Galactic Intelligence has intercepted chatter that a merciless alien race is planning an attack.


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