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.

Frontier Justice – The Survivalist

Free
Science Fiction, Action
4.3★ 7500+ ratings

The Superpox-99 virus has wiped out nearly the entire human race. To stay alive, U.S. Deputy Marshal Mason Raines must forage for food, water, and gasoline while outgunning opportunists.


Amazon

Sub-Human

Free
Science Fiction, Action
4.1★ 2000+ ratings

When World War III strikes, Dr. Craig Emilson is sent to take out a powerful AI. He becomes the greatest hope for humanity. He must choose between himself or all mankind.


Amazon

ARISEN: Last Stand

Free
Science Fiction, Action
4.6★ 750+ ratings

One platoon of legendary Rangers. An isolated combat outpost in the Spin Ghar mountains. 150 Taliban survivors armed with Tier-1 weapons. And all the rampaging dead guys in central Asia.


Amazon

Into the Dark

Free
Science Fiction, Adventure
4.2★ 200+ ratings

This dark universe offers a game of cat and mouse through the galaxy with twists and turns at every solar system. Lost alien civilizations, six-limbed insectoid warriors, plasma rifles, and more!

Amazon

Altered Genes

Free
Thriller, Science Fiction
4.4★ 1000+ ratings

After Professor Simmons learns of a genetic threat unlike anything the world has ever seen, he, Dr. Ling, and an odd group of survivors find themselves on the run as civilization collapses around them.


Amazon

The Night Land

Free
Science Fiction
4.0★ 200+ ratings

The sun went out centuries ago. A vestige of mankind still clings to life, hidden from Earth’s frozen surface in an underground fortress, but this tenuous refuge is under siege.


Amazon

Lake of Sins: Escape

Free
Science Fiction, Teen
4.2★ 1000+ ratings

Every year after harvest, the weakest are removed from the encampment. None of them are ever seen or heard from again. Trinity escapes into the forest, but she’s hunted from land and sea by predators.


Amazon

Wild Nines

Free
Science Fiction, Adventure
3.9★ 100+ ratings

Framed for murder on a fringe outpost, a ragtag mercenary crew must find the truth before bounty hunters take their lives. Davin has to find out what happened while outrunning merciless authorities.


Amazon

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

Mind Secrets

Free
Science Fiction, Teen
4.2★ 500+ ratings

Waking up being hunted, Michael finds sanctuary with a group of telepaths who sense thoughts and emotions. To save his friends, he must confront his forgotten secrets.


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

Ash

Free
Science Fiction, Novella, Suspense
4.4★ 500+ ratings

Facing the zombie apocalypse in a wheelchair might prove a challenge to others. For thirteen-year-old Ash, it’s just another fight for her life.


Amazon

Cul-De-Sac

Free
Science Fiction, Adventure
4.4★ 300+ 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

Broken Skies

Free
Science Fiction, Teen
4.2★ 750+ ratings

Jax will do anything to save her twin . . . even team up with a teenage alien left behind by the same ship that took her brother. She agrees to work with the alien, but it isn’t that easy.

Amazon

The Legacy Human

Free
Science Fiction, Action
4.2★ 1000+ ratings

Elijah Brighton wants to become an ascender. But he is a legacy human, preserved and cherished for his unaltered genetic code. Soon, the ascenders and the legacies they keep start to unravel.


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