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.

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

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.


Amazon

Saving Mars

Free
Science Fiction, Teen
4.2★ 750+ ratings

Some pilots follow orders. Others just wing it. Grounded for her Top Gun attitude, Jessamyn jumps at the chance to fly a covert mission to off-limits Earth and save her world from starvation.


Amazon

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.


Amazon

The Bionics

Free
Science Fiction, Action
4.0★ 1000+ ratings

It is the year 4006, and nuclear war has come to the United States. The Restoration Project offers the sick and injured a second chance. Until the Bionics are forced to go into hiding.

Amazon

Emergence

Free
Science Fiction, Action
4.1★ 1000+ ratings

Aliens have invaded the Milky Way. Captain Martin and his fleet at the opposite end of our galaxy are all that stand between the emerging ancient aliens and certain destruction of humanity.

Amazon

Time’s Assassin

Free
Science Fiction, Adventure
3.9★ 50+ ratings

In 2073, the once-mighty United States teeters on the brink of economic collapse, its industries in ruins. But for those who make it through time traveler training, wealth and freedom await.


Amazon

HADRON Dark Matter

Free
Science Fiction, Action
4.2★ 2500+ ratings

When scientists at the Large Hadron Collider discover dark matter, celebration quickly turns to catastrophe. Lights go out. Networks are gone. Civilization collapses in an instant.

Amazon

Galaxies Lost – Episode One

Free
Science Fiction, Adventure
4.3★ 50+ ratings

Jodi is the greatest traitor the Coalition has seen – at least that’s the theory. Rotting for two years in jail, she’s dreamed of saving the galaxy. But she’s forgotten that redemption isn’t easy.

Amazon

War Without End

Free
Science Fiction, Action
4.2★ 400+ ratings

The Terran Empire, the greatest empire in the history of humanity, is crumbling. Throughout the galaxy, planetary systems seek independence and freedom. What price will Danny pay for freedom?


Amazon

Al Clark

Free
Science Fiction, Adventure
4.3★ 2500+ ratings

Al Clark is on a quest that will take him places he could not have imagined, manage feats he would not have thought possible, and teach him the true meaning of friendship.


Amazon

Legacy

Free
Science Fiction, Teen
4.2★ 300+ ratings

Willow Oak Watson is locked inside an experimental world. Fillion Nichols has never met the girl who haunts his dreams. A chilling secret forever binds their lives together.


Amazon

Under Falling Skies

Free
Science Fiction, Teen
4.2★ 200+ 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

Transient

Free
Science Fiction
4.0★ 750+ ratings

In a dark and distant future, death is obsolete. But the fates of billions hang in the balance. When the axe falls, Jonas must choose between his family and his species.


Amazon

Resistance

Free
Science Fiction, Action
4.2★ 100+ ratings

Her remote forest community isn’t safe anymore. Driving damaged roads to a city she hasn’t seen for six years, Jac uncovers disturbing truths about those controlling their lives


Amazon

Forgotten

Free
Science Fiction, Supernatural
4.3★ 2000+ ratings

While struggling to regain her memory, Lena explores her extrasensory powers. As she tries to figure out who and what she is, she makes a frightening discovery.


Amazon