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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.

Forbidden the Stars

Free
Science Fiction
4.0★ 2000+ ratings

An expatriate seizes an opportunity to wrest control of outer space. The secret to faster-than-light speed is up for grabs, and the race for interstellar space begins!


Amazon

Fade to Blue

Free
Science Fiction, Thriller
4.1★ 100 ratings

Biotech researcher Sarah Brenalen is frustrated by the dismissal of her controversial theory, so she secretly injects lab mice with experimental Alzheimer’s drugs. Her experiment goes horribly wrong.

Amazon

Ashes of the Fall

Free
Science Fiction, Adventure
3.9★ 1000+ ratings

Con man Luke Stokes artfully navigates the crumbling remnants of North America. Sometimes the fall isn’t always the end. Sometimes, it’s only the beginning.


Amazon

Edge of the Breach

Free
Science Fiction
4.5★ 200+ ratings

We all become monsters at the edge of the breach. In a post-apocalyptic world where season of birth determines power, interrealm war beckons two lost and fated souls.


Amazon

The Rowan Tree

Free
Fiction, Literary
3.9★ 2500+ ratings

Reaching from the 1960s into humanity’s global future, an international cast of characters personifies the catalytic role of love and sex in political change.


Amazon

Run from Ruin

Free
Science Fiction, Thriller
4.1★ 500+ ratings

They’re not undead; they’re just angry…The DataMind meditation app revolutionized the world, making people smarter, happier, and more productive. But a programming glitch had some side effects.


Amazon

Soldier of Fortune

Free
Science Fiction, Adventure
4.5★ 1500+ ratings

Wrongly convicted of treason, Colonel Gideon Quinn, with his pet draco Elvis, boards an airship bound for Nike City in search of revenge. And justice. But mostly revenge.


Amazon

Three Days in Undead Shoes

Free
Science Fiction, Action
4.5★ 500+ 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.


Amazon

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

Desolation

Free
Science Fiction, Thriller
4.1★ 100+ ratings

After five mushroom clouds appear on the horizon, college student Jenn Jansen, torn between finding her family in Phoenix and helping her friends in Flagstaff, is forced to confront the brutal realities of this new, unforgiving world.


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

Tucker vs. the Apocalypse

Free
Science Fiction
4.5★ 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

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

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

Starship Waking

Free
Science Fiction
4.4★ 1000+ ratings

On an icy, barren world, a starship dreams of doom. Worlds are about to collide and the galaxy will be shaken to its core because the starship is waking.


Amazon

Rift

Free
Science Fiction
4.2★ 4000+ 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