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.

Oblivion Threshold

Free
Science Fiction, Adventure
4.2★ 1000+ ratings

It isn’t a war—it’s a massacre. Mindless mechanical aliens are destroying everything in their path. And their path is heading straight for Earth.

Amazon

Quantum Cheeseburger

Free
Science Fiction, Adventure
4.3★ 100+ ratings

Driving his vintage Jeep down a lonely highway in the New Mexico desert, Chris, an ordinary guy with a horrible boss, makes a terrible mistake. Now military, mercenaries, and aliens are hunting him.

Amazon

The Kalis Experiments

Free
Science Fiction, Adventure
4.1★ 100+ ratings

Syrina, a Kalis master of disguise, embarks on a perilous mission in the steam-powered city of Fom where she learns of a machine that could end civilization a second time.


Amazon

Playing In The Rain

Free
Science Fiction, Teen, Suspense
3.9★ 200+ ratings

When the effects of a hypnosis-inducing drug fade, April slowly begins a conscious awakening. But can April remember her past? Will she have the courage to leave – and if she does, where can she go?

Amazon

Space Colony One: Books 1-3

Free
Science Fiction
4.3★ 2000+ ratings

A new planet is not the paradise the scientists predicted. With alien predators lurking and stowaway saboteurs, Ethan must fight to preserve the last hope of humankind.


Amazon

Maelstorm

Free
Science Fiction, Adventure
4.1★ 500+ ratings

A hundred years from now, when selection day comes around, Gideon Rayne is entrusted with a miraculous suit of high-tech armor and put on a collision course with forces darker than he never knew existed.

Amazon

Genesis

Free
Science Fiction, Adventure
4.1★ 75+ ratings

Hokura finds out that where one secret ends, another begins. And the one holding all the answers is Professor Dorian who rose from the ashes to create a new dawn after the world ended and mankind fell.


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Now And Then

Free
Science Fiction, Romance
4.6★ 500+ ratings

Doctor Paige Randolph doubts that anything can help her recover from the loss of her child and marriage —until a mysterious crop circle casts her back one hundred years.


Amazon

Symbiosis

Free
Science Fiction
4.0★ 750+ ratings

Pursuing an escaped alien, Justice Keeper Anna Lenai discovers her ancestors’ lost homeworld.

Amazon

Blackwing

Free
Science Fiction
4.2★ 200+ ratings

Is Socrates Blackwing’s magic stronger than the technology of 2070? And what will this wizard, warrior, and bounty hunter do when confronted with one of his own kind?

Amazon

Desa Kincaid – Bounty Hunter

Free
Science Fiction
3.8★ 500+ ratings

Blessed with the power to transform ordinary objects into devastating weapons, can Desa Kincaid stop a man whose experiments have killed over a dozen people before he unleashes something terrible on the world?

Amazon

Freedom Legends

Free
Science Fiction, Action
4.2★ 1000+ ratings

For five hundred generations, humanity has been enslaved—addicted to a drug engineered to keep us docile under alien rule. But now, a mysterious virus is spreading hope.


Amazon

Dawn of Rebellion

Free
Science Fiction, Teen
4.2★ 200+ ratings

Criminals are sent to the colonies to work as slaves. It’s a savage place, especially for a teenage girl from the wrong side of London. They’ve taken Dawn Nolan’s sister. She might die trying, but Dawn is going to get her back.

Amazon

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…


Amazon

A Hero

Free
Science Fiction, Action
4.3★ 400+ ratings

Rayford Tyvos Jackson once dreamed of a stable life for his family, but when alien invaders destroy everything he loves, grief turns to insatiable vengeance.


Amazon

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.

Amazon