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.

Scarlet Angel

Free
Thriller, Science Fiction
4.4★ 75+ ratings

Scarlett’s quest for her forgotten past leads her into a dangerous world of espionage and crime. Is it worth becoming the kind of monster she is trying to stop?

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Extensis Vitae

Free
Science Fiction, Adventure
4.1★ 1000+ ratings

Michael Reznik is a soldier who wakes up in a mysterious underground bunker, with a technologically advanced body he doesn’t recognize. The people around him have cast aside fighting and warfare.

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Gravity Drive

Free
Science Fiction
4.2★ 200+ ratings

Since the invention of rockets, their propulsion systems have gone essentially unchanged. But what if we could go to our Moon in hours or Mars in a couple of days? It all starts in Roswell…


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Rogue Star: Frozen Earth

Free
Science Fiction, Action
4.2★ 2500+ ratings

Logan’s life is falling apart: he lost his job and found out that his wife is cheating on him all in the same day. Thinking that his world has ended, Logan turns on the TV and finds out he’s right.


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Rogue Assembly

Free
Science Fiction, Action
4.5★ 300+ ratings

A combat android made as a human decoy returns to civilisation in search of a technician who can help her with a systemic problem. She is drawn into a world of violent cyborgs and rare technology.


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Backlash

Free
Science Fiction, Novella
4.1★ 50+ ratings

In the space of ten hours, civilization was gone. Facing an unknown adversary that threatens to wreak havoc across what little humanity remains, they must rely on their unusual abilities to survive.


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Terminus Cycle

Free
Science Fiction, Adventure
4.0★ 100+ ratings

Two generations lived and died aboard the Omega Destiny, but home is on the horizon. Everything is going according to plan until they discover a strange object in space shrouded in mystery.


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Out of Time

Free
Urban Fantasy, Historical, Romance
4.1★ 2500+ ratings

Professor Simon Cross has spent his life searching for evidence of vampires. When an accident transports them to 1920s Manhattan, Simon and Elizabeth’s developing relationship is tested by demons real and imagined.


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Terran Catalyst

Free
Science Fiction, Adventure
4.0★ 50+ ratings

Henry Blue is a Spacer whose family is facing financial ruin. Desperate, he steals the family’s oldest freighter, the Charlie B., to make a run to a restricted planet…Earth.

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Guardian

Free
Science Fiction, Action
4.1★ 500+ ratings

Alone and hunted, Amber connects with Raven, a young woman, who claims to know her history. According to Raven, Amber is an alien princess exiled to Earth by a war that claimed the lives of her family.

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Irrelevant

Free
Science Fiction, Romance, Teen
4.2★ 500+ ratings

Branded Irrelevant, Mallory is banished to live in the old city. But in the wasteland between the new city and the old, she stumbles on Cristan. To survive, Mallory must figure out who to trust, and embrace the behavior she’s been taught to deny. 


Amazon

Outliers

Free
Science Fiction, Teen
4.3★ 750+ ratings

Indra is an Outlier. Living on land that has not healed from the poison of the past, the Outliers have adapted – but to the Sovereign and the Fortis, they are nothing.


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Back to Titanic

Free
Romance, Historical
4.7★ 30+ ratings

Sailing on Titanic 2 was supposed to be a fun trip, but it turned into a nightmare. After a nasty fall, I wake up on the actual Titanic–a ship history says is about to sink in a couple of days.


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Forgotten Stars

Free
Science Fiction, Adventure
4.1★ 750+ ratings

Everything changes when Amber is lost on an alien world and her true powers awaken. She must keep them secret from the Coalition or pay the price.


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Tiger’s Gambit

Free
Science Fiction, Romance
4.3★ 500+ ratings

Earth is dying, humanity borders on extinction. Our plight seems hopeless. When my transport is hijacked, I’m forced to show my true form to protect myself.


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Solar Storm

Free
Science Fiction, Adventure
4.1★ 1000+ ratings

He had the perfect life as a small-town librarian, but the sun had other plans and sent a coronal mass ejection as a wedding anniversary present. In a world where electricity is a thing of the past, can there be any hope for the future?


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