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.

Dhata Mays

Free
Science Fiction, Mystery
4.0★ 100+ ratings

After a devastating war forced humans to rely on synths for survival, the two have learned to coexist peacefully. Until now. And detective Dhata Mays must find a way to protect them all.

Amazon

Death by Decent Society

Free
Science Fiction, Action
4.2★ 100+ ratings

This is the future we should have seen coming. A world without governments or nations, without any law above the greed of the rich. As the outrage of the people roars and some dream of revolution, the guns of the elite roar back.

Amazon

The Farthest Star

Free
Science Fiction, Adventure
3.9★ 750+ ratings

Given a mission by humanity’s last digital remnants, intelligent machine Gamma must traverse Starship’s vast, dangerous bulk in search of a way to preserve Starship’s original purpose.

Amazon

Time Rocks

Free
Science Fiction, Adventure
3.9★ 400+ ratings

An archaeological dig at Stonehenge turns into a nightmare for young Jack Shire when he is blasted into a terrifying prehistoric world, simultaneously unveiling a deadly, 21st century secret.


Amazon

Oversight

Free
Science Fiction, Teen
4.2★ 100+ ratings

Seventeen-year-old Zelly is a self-proclaimed computer geek. She’s also a leader of Soul Identity, a group that promises to pass people’s fortunes and memories on to their future selves.


Amazon

Dinosaur Lake

Free
Science Fiction, Thriller
4.3★ 2500+ ratings

An ancient predator has been reborn in the caves beneath Crater Lake… and it’s hungry. Chief Park Ranger Henry Shore must not only protect his park and his people from the monster but somehow find and destroy it.

Amazon

A Dead Ship in the Deep Black

Free
Science Fiction, Adventure
4.4★ 200+ ratings

Tink is used to a life of odd jobs and even odder crewmates, working as the engineer and all-around fixer on the cargo ship Lyra. But when the ship makes a stop, things go sideways in a cosmic way.


Amazon

The Mason Timeline Series

Free
Science Fiction, Adventure
4.0★ 40+ ratings

Alfredo Jaramillo was just another foster child with a temper. No one expected him to gain admission to Warner University, the world’s only time traveler training facility.


Amazon

Day of the Devourer

Free
Science Fiction, Adventure
4.3★ 100+ ratings

Rej Antares, a disgraced former galactic agent, has landed in prison on a remote third-world planet. Now Galactic Intelligence has intercepted chatter that a merciless alien race is planning an attack.


Amazon

Taken

Free
Science Fiction, Romance
4.2★ 500+ ratings

Respect the alien, fear his daughter… Between dodging her claws and avoiding cultural taboos, Viktor has to show the Lyrissians that joining the Alliance is the best choice.

Amazon

Death’s Door

Free
Science Fiction, Historical
4.5★ 1000+ ratings

In the fall of 1849, Edgar Allan Poe disappeared. He was missing for five days and was then found wandering near Gunnar’s Hall in Baltimore. Poe eventually stumbled into the 21st Century.

Amazon

Jess Be Yourself

Free
Science Fiction, Middle Grade
4.3★ 10+ ratings

Does Jess have amnesia, or is everyone at school in on some elaborate joke? The truth is crazier and scarier than she could have ever imagined.

Amazon

Before the Cure

Free
Horror, Science Fiction
4.2★ 250+ ratings

In Neil’s mind it started with the man in the park. Or, more specifically, with the vicious bite the man had given Neil. He was wrong about that. The December Plague had started weeks earlier, though no one knew it.

Amazon

Harry Watt, Bounty Hunter

Free
Science Fiction, Humor
4.0★ 400+ ratings

Harry Watt is a bounty hunter who discovers something stinks about his latest case. And getting framed for murder doesn’t help. As the case unravels, Harry must call on all his skills to crack the secret of Mars.

Amazon

Firmament: Radialloy

Free
Science Fiction, Adventure
4.3★ 100+ ratings

The year is 2320. Two factions are desperate for a valuable secret. Andi Lloyd must race to help her father and herself before time runs out.

Amazon

Anti Life

Free
Science Fiction, Adventure
4.0★ 750+ ratings

Space-based corporate settlements have replaced the State and Colonel John Alvarez, a fifteen-year veteran, is unwilling to waste more years leading missions into deep space.

Amazon