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.

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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Call of the Goddess

Free
Science Fiction, Teen
4.1★ 40+ ratings

With the fate of her people hanging in the balance, Axandra must navigate treacherous plots and dangerous factions to protect those she loves.


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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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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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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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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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Hell Week

Free
Science Fiction, Suspense
4.3★ 1000+ ratings

In the midst of the holidays, a biological attack wreaks havoc on the U.S. For Isaac Race, it’s especially bitter. After the death of his parents and sister, he was just getting his life on track.

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Irrelevant

Free
Science Fiction, Romance, Teen
4.2★ 600+ 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. 


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Outliers

Free
Science Fiction, Teen
4.3★ 500+ 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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Forgotten Stars

Free
Science Fiction, Adventure
4.1★ 500+ 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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Prep For Doom

Free
Science Fiction, Collection
4.3★ 100+ ratings

From the imaginations of twenty authors of dystopian and post-apocalyptic fiction comes an integrated collection of short stories that tell the tale of a single catastrophe as experienced by many.


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Insight

Free
Science Fiction, Novella
4.4★ 100+ ratings

Detective Reese Parker left behind a violent past in Welfare Colony 6 and now works with the New York Enforcer Division to make certain their society never faces another economic and nuclear Breakdown.


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When We Were Human

Free
Science Fiction, Teen
4.3★ 100+ ratings

They came four years ago. Invaded our planet, rounded us up, decimated the human race. We fought back, and some even say we won, but they’re wrong.

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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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Dark Days: The Dragon Engine

Free
Science Fiction
3.9★ 20+ ratings

Nothing and everything is possible in this sci-fi actioner as Detective Cajun Reyes investigates a series of mysterious murders that seem to defy science and reason.


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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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