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.

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.


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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.

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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.


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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.

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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.

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The Trilisk Ruins

Free
Science Fiction
4.2★ 5000+ ratings

Telisa refuses to join the government because of its hard-handed policies restricting civilian investigation and trade of alien artifacts, despite her father, a Space Force captain.

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Bypass Gemini

Free
Science Fiction, Adventure
4.4★ 2000+ ratings

A package gets Trevor “Lex” Alexander mixed up with mobsters, a megacorp, and a mad scientist. Now his life depends on learning what their plans are and how he can stop them.

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Tentacles And Teeth

Free
Science Fiction, Adventure
4.3★ 750+ ratings

The sudden invasion of monsters left the world shattered. Now, armed with her bow and blade, Askari sets off alone, to learn not only about the world she lives in but also question what she believes about herself.

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The Becoming

Free
Science Fiction, Action
4.2★ 1000+ ratings

The Michaluk Virus is loose. As the virus transforms the population into homicidal cannibals, three people band together against the oncoming crush of death and terror.


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I AM MAN

Free
Science Fiction, Christian
4.3★ 75+ ratings

Fresh from the factory, X5 agrees to help an exiled princess escape from prison. He believes he’ll carry out a simple mission but then the two of them discover a scheme that threatens to unravel the very fabric of the Valetian Empire.


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Rogue Stars Series

Free
Science Fiction, Collection
4.3★ 1500+ ratings

Jump into seven full-length novels exploring the last great frontier. Rogue Stars has alien invasions, artificial intelligence, galactic intrigue, and heroes that will defy orders to do what is right.

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First Strike

Free
Science Fiction, Action
4.3★ 4000+ ratings

When war comes, it is sudden and brutal. Second Lieutenant Michael Sheridan finds himself thrust into a desperate conflict that he and the untried soldiers under his command are not ready for. 

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Tesla

Free
Science Fiction, Suspense
3.9★ 200+ ratings

After recovering space-age technology amidst the fallout of an assassination, Special Forces soldier Darren Mathews obtains Earth-shattering documents. But for every ancient secret learned, he will have to pay a price.

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Alien Species Intervention

Free
Science Fiction, Suspense
4.0★ 1000+ ratings

After years of enslavement, Netty flees into the night from her husband, traveling back to her parents’ farm, where she rescues an enigmatic and damaged creature named “Baby” with whom she falls in love.


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Traveler in The Dark

Free
Science Fiction
4.0★ 600+ ratings

Sixteen hundred years ago, they fled Earth. Now their long journey may finally be at an end. But they must make a choice. Sacrifice another species or accept their own extinction. And time is running out.

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Grail Protocol

Free
Science Fiction, Thriller
4.2★ 50+ ratings

What happens when an old man suddenly returns to youthful vigor while his wife remains old? Or when a grandmother is suddenly younger than her grandchild? Immortality comes with a price tag.


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