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.

Girl Fights Back

Free
Thriller, Science Fiction
4.4★ 1000+ ratings

Emily Kane has gone missing and the world’s spy agencies are determined to find her. They think she’s been genetically modified as a human weapon. Now, she’ll need all her skills to see tomorrow.


Amazon

Yesterday’s Thief

Free
Science Fiction, Thriller
4.4★ 1500+ ratings

When a woman materializes in midair during a televised baseball game, private detective Eric Beckman vows to figure out where—or when—she came from. And if he can’t unlock her secrets, the world will spiral into chaos.


Amazon

Endless Chaos

Free
Science Fiction, Action
4.1★ 50+ ratings

When the Coalition is swept up in a deadly game, Death Spiral, only one cadet can save them. Sharon has a mind honed to play the most brutal game of all and she has to win.

Amazon

Roy

Free
Science Fiction, Humor
4.0★ 750+ ratings

This is the story of Roy, the architect of an epic crisis that paralyzed the largest space station in the universe. The lunacy behind it remained a mystery. Until now.


Amazon

Reaper’s Run

Free
Science Fiction, Action
4.3★ 2000+ ratings

When Marine Sergeant Repeth’s blown-off legs begin to regenerate, she thinks it’s a miracle. But the breakthrough is exactly what the government desperately wants to quash.

Amazon

The 28th Gate

Free
Science Fiction, Adventure
4.3★ 1000+ ratings

When he accepted the job on a backwater planet, Hunter thought it would be easy to track down a missing researcher. But when he finds her, he realizes all is not as he was told.


Amazon

The Dark Rift

Free
Science Fiction, Supernatural
4.1★ 400+ ratings

Strange events lead archaeologist Gabriel Parker to a relic, and to the only person on earth who can help him unravel its apocalyptic mysteries.

Amazon

Free Falling

Free
Thriller, Science Fiction
4.1★ 2500+ ratings

A fun family vacation turns into an apocalyptic nightmare when a couple and their young son find themselves trapped in the Irish countryside during an international crisis.


Amazon

The Last Orphans

Free
Science Fiction, Teen
4.1★ 2500+ ratings

Filled with cinematic science fiction action, end of the world apocalyptic events, and heart pounding thrills, The Last Orpans will leave you enthralled from beginning to end. 

Amazon

Revolution

Free
Science Fiction, Action
4.4★ 20+ ratings

Promises are lies. Allies are enemies. Utopia means subjugation. In the turmoil of the early 21st century, First Contact expanded our understanding. Some believe the promises and others seek the truth.

Amazon

Come Home to Me

Free
Romance, Science Fiction, Historical
4.4★ 2500+ ratings

Jake is sent back in time to protect a woman along the Oregon Trail. When he and Rachel’s forbidden attraction turns to love, what will happen at the end of the trail?

Amazon

Brothers in Exile

Free
Science Fiction, Adventure
3.9★ 750+ ratings

When star-wandering brothers Isaac and Aaron Deltana find a beautiful young woman locked in cryofreeze, they get caught in the middle of a frontier war in their hopes of finding someone who can revive her.


Amazon

The Alpha Plague 3

Free
Science Fiction, Suspense
4.4★ 300+ ratings

After having rescued his ex-wife from the diseased in Summit City, Rhys races to meet his son only to discover he isn’t there. But there’s hope. The boy has left a trail.

Amazon

War Bunny

Free
Fantasy, Teen
4.3★ 400+ ratings

In a post-apocalyptic world where humans are extinct and animals thrive, a young rabbit is locked in a ferocious battle for survival—and maybe even freedom.


Amazon

Warpworld

Free
Science Fiction, Adventure
4.4★ 400+ ratings

To save an oppressed people and a dying planet, Seg and Ama must form an uneasy alliance. The fate of two worlds is in their hands, and together, they’ll change the course of history.


Amazon

Close Liaisons

Free
Romance, Science Fiction
4.1★ 5000+ ratings

For college student Mia Stalis, the invaders—the beautiful, mysterious Krinar—are only stories on the news. None of the rumors concern her until she catches Korum’s eye.

Amazon