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.

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

Whispers in Autumn

Free
Science Fiction, Teen
4.3★ 750+ ratings

In 2015, a race of alien Others conquered Earth. They enslaved humanity not by force, but through aggressive mind control that turned people into contented robots. Except Althea isn’t content at all.


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

The Keepers

Free
Science Fiction, Teen
4.0★ 100+ ratings

After young Connor is gifted with superhuman abilities, her life changes. When she learns of others like her, she sets out on a path to discover her true origin. But are the powers a gift or a curse?


Amazon

Mercury’s Shadow

Free
Science Fiction, Action
4.3★ 100+ ratings

Imogen “Chim” Esper is thrust into the center of an interplanetary conflict when a cruel and indifferent corporation tears her family apart. She has no choice but to run.

Amazon

The Lunar Deception

Free
Science Fiction, Mystery
4.0★ 100+ ratings

Alya is a mutant whose genes were contaminated by an accident on the moon. This gives her extraordinary powers that she keeps hidden, but she’ll risk her secret being discovered to save her friends.


Amazon

Genesis

Free
Science Fiction, Adventure
4.1★ 100+ 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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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?

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

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

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.


Amazon

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.


Amazon

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.


Amazon

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.


Amazon

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.


Amazon

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.

Amazon