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.

Betrayal

Free
Science Fiction, Adventure
4.2★ 2000+ ratings

Captain Shepperd is about to learn that you can’t hide from the sins of your past, especially when the priceless synthetic stowaway on his ship is programmed to kill.


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Earthbound

Free
Science Fiction, Historical
4.2★ 200+ ratings

Marooned in the 19th century US West, an alien must survive and return to his homeworld to destroy his mortal enemies and avenge his people.


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Miltan Epsilon

Free
Science Fiction
4.2★ 50+ ratings

Miltan Epsilon follows Jazz Healy as she runs valuable cargo via a galaxy-spanning criminal organization.

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The Emperor’s Edge

Free
Science Fiction, Epic Fantasy
4.4★ 2500+ ratings

In the steampunk fantasy The Emperor’s Edge, law enforcer Lokdon must hunt down the empire’s most notorious assassin.

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Outworlder

Free
Science Fiction, Novella
3.9★ 1000+ ratings

When Jeremiah arrived at Megiddo Station, all he wanted was to make some trades and resupply his starship. He never thought he’d come away with a wife.

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The Alpha Plague

Free
Science Fiction, Suspense
4.0★ 2500+ ratings

Do you have a plan for the apocalypse? Rhys doesn’t. But as he watches chaos spill from the Alpha tower, he knows one thing. He must get to his son before the virus does.


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Residual Belligerence

Free
Science Fiction, Adventure
4.2★ 500+ ratings

Zach Hilyer is in trouble. He is good, one of the top field operatives in the infamous Thieves’ Guild. Problem is, he can’t remember when it all went wrong.

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Traitor

Free
Science Fiction, Adventure
4.2★ 200+ ratings

On the edge of a far frontier rests a place of gentle manners and common civility–Last Chance. Threats of war change all of that. Aaron may not be all that they hoped for.

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Onslaught

Free
Science Fiction
4.1★ 300+ ratings

When mutants from civilization’s end come roaring back from exile, telepath Langston Wheeler must confront assassination, interstellar intrigue, and a woman he can’t resist.


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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.


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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.


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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.


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Marked

Free
Science Fiction, Teen
4.3★ 1000+ ratings

In this dystopian romance, Ruby had barely started kindergarten when the world collapsed, but by now she’s over it. When things go sideways, will the long-forgotten past come back to claim its due?


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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.


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Taken

Free
Steamy Romance, Science Fiction
4.3★ 1000+ ratings

Jayne is a feisty human lawyer plucked from Earth by a beast of an alien captor, Rexitor. “All enemies of the Empire must die. But not her, she is mine to claim…”


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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.


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