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.

Star Nomad

Free
Science Fiction, Adventure
4.4★ 5000+ ratings

Alisa has more problems than she can count, but she can’t let cyborgs, savages, or ancient malfunctioning ships stand in her way. If she does, she’ll never see her daughter again.

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Three Days in Undead Shoes

Free
Science Fiction, Action
4.4★ 750+ ratings

Jane Finch wishes her problems ended with a bad commute and no coffee. But when she and her beloved Great Dane, Schrodinger, emerge from a locked room they discover a city changed for the undead.


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The Eye of the Gods

Free
Science Fiction, Adventure
4.2★ 400+ ratings

Vivian Bond and Special Commander Jake Trace are thrown together in a fight for the Milky Way and beyond as an ancient power rises once more.


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Monte Vista Village

Free
Science Fiction, Suspense
4.2★ 300+ ratings

Laura survived the global nuclear war. When she walked out into the devastated landscape, she found something worse than zombies. The real enemy is what’s left of the desperate earth.

Amazon

The Debt Collector: LIRIUM

Free
Science Fiction, Action
4.2★ 300+ ratings

Lirium plays the part of the grim reaper well, with his dark trenchcoat and jackboots—he’s just in it for his cut, ten percent of the life energy he collects before he transfers it to the deserving.


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Tucker vs. the Apocalypse

Free
Science Fiction
4.4★ 200+ ratings

Household pet dog Tucker is thrust into an apocalyptic world when not only his own ‘master’, but all of humanity, are stricken with a deadly plague.

Amazon

All Your Lives Belong To Us 

Free
Science Fiction, Humor
4.2★ 10+ ratings

Lemon’s masterpiece Elysium, a massive multiplayer video game, is released with dismal sales numbers. Now, Nick believes he’s inside his dead wife’s video game. Only, it’s just a game… right?


Amazon

Of Cinder and Bone

Free
Science Fiction, Suspense
4.3★ 500+ ratings

Jack and Kamala brave the dangerous streets of Tokyo to steal their dragon back in a race against time before the world is taken over by mutated, bloodthirsty monsters that will raze it to ashes.

Amazon

Tiberius Found

Free
Science Fiction, Teen, Thriller
4.3★ 200+ ratings

Daniel Henstock thinks he’s an ordinary kid but on his sixteenth birthday, his world is turned upside down. He realizes he is the world’s first one-hundred-percent genetically-engineered human.


Amazon

Concensus

Free
Science Fiction, Suspense
4.4★ 100+ ratings

Ena Waite can’t help challenging the flawed mindset of her family and friends. But in Esh, truth is determined by a public opinion network. Social rating is the currency. Fitting in is essential.


Amazon

Rift

Free
Science Fiction
4.2★ 2500+ ratings

As Sue is nearing Selection Day, she secretly hopes to be chosen, despite having to leave her mother and brother behind. But when she learns the secrets of the Covenant, Sue questions everything she has always taken for granted.

Amazon

Flash Gold

Free
Science Fiction, Novella
4.4★ 1000+ ratings

Fortune seekers and airship pirates are after eighteen-year-old Kali McAlister for the secret to flash gold, her late father’s alchemical masterpiece. When a sword-slinging stranger shows up, she’s sure he has ulterior motives.


Amazon

Activate

Free
Science Fiction, Suspense
4.1★ 300+ ratings

Years of calamities took humanity to the brink of extinction. Now, with the aid of a time capsule, the human race is once more populating the Earth, resurrecting technologies lost centuries earlier.


Amazon

She Dreams of Me

Free
Science Fiction
4.3★ 20+ ratings

Amanda lives in the Polis, an underground human colony that is thought to be the only surviving human society. To save her beloved city, Amanda’s secret must be revealed, endangering the lives of everyone she loves.


Amazon

Love in an Undead Age

Free
Science Fiction, Teen
4.3★ 200+ ratings

Some scars don’t heal. They fester. Haunted by a past she can’t escape and torn between loyalties that threaten to destroy her, Miranda discovers that trust can be fatal, and love might be worse.


Amazon

The Trilisk Ruins

Free
Science Fiction
4.2★ 5000+ ratings

Telisa refuses to join the government because of its hard-handed policies restricting civilian investigation and trade of alien artifacts, despite her father, a Space Force captain.

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