Looking for science fiction novels? We've gathered 37 free science fiction novels in PDF, from classic sci-fi and space opera to time travel and alien invasion stories.
H. G. Wells, Jules Verne, Mary Shelley, and Edgar Rice Burroughs imagined submarines, space flight, and trips through time long before they seemed possible. You'll also find pulp favorites like E. E. Smith and Andre Norton, who took the genre to the stars.
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Classics
Classic Science Fiction Novels
This is where science fiction novels began. Frankenstein came out in 1818, and Verne and Wells went on to invent almost every idea sci-fi still uses.
Professor Lidenbrock decodes an old runic note and leads his nephew down an Icelandic volcano. Verne fills the descent with underground seas, giant mushrooms, and living fossils.
Three castaways end up aboard the Nautilus, the electric submarine of the mysterious Captain Nemo. A full tour of the ocean floor written decades before submarines could do it.
The Baltimore Gun Club decides to fire a manned shell at the Moon. Both parts of the story in one volume: the launch and the flight around the lunar surface.
A shipwrecked man lands on an island where a disgraced surgeon reshapes animals into something close to human. One of the first novels to question the limits of science.
A broke businessman and an absent-minded inventor reach the Moon in a sphere coated with a gravity-blocking material. Below the surface they find the insect-like Selenites.
Professor Challenger leads an expedition to a South American plateau where dinosaurs never died out. The novel that gave the lost world story its name.
A mining machine bores straight through the crust and comes out in Pellucidar, a prehistoric world on the inside of the Earth. First book of the series.
Millions of years from now the Sun has gone out and the last humans live inside a giant metal pyramid. A long, strange, and influential vision of a dying Earth.
A square living in a two-dimensional world is visited by a sphere. Part satire, part geometry lesson, and still the clearest way to picture extra dimensions.
Professor Challenger predicts that the Earth is about to pass through a belt of poisonous ether. He and his friends seal themselves in a room and watch the world stop.
A machine that is car, boat, submarine, and aircraft at once starts appearing across the United States. A federal inspector sets out to find the man who built it.
A man travels to Tormance, a planet orbiting Arcturus, and grows new senses in every land he crosses. A philosophical journey that shaped C. S. Lewis and Tolkien.
Big ships, bigger stakes. These science fiction novels trade the lab for whole galaxies, from the red deserts of Barsoom to the first faster-than-light voyages.
Confederate veteran John Carter wakes up on Mars, where low gravity makes him the strongest fighter on a dying planet. First book of the Barsoom series.
After his bride is murdered at their wedding, Lucas Trask takes a warship and goes raiding among the ruined planets of a fallen federation. Revenge turns into empire building.
The crew of the free trader Solar Queen is declared a plague ship and hunted across space. The youngest members have to clear its name before it is destroyed.
A Victorian inventor rides his machine to the year 802,701 and finds humanity split into the gentle Eloi and the underground Morlocks. The book that invented the time machine.
A blow to the head sends a 19th-century factory boss back to Camelot, where he tries to modernize the Middle Ages. Twain's satire is one of the first trips to the past.
A Bostonian falls asleep in 1887 and wakes up in the year 2000, in a country without poverty or money. One of the best-selling American novels of its century.
A man sleeps for 203 years and wakes to learn that compound interest has made him owner of the world. The people who ran it in his name are not ready to hand it back.
Two New England sisters board a flying machine that circles the North Pole to turn back time and end up in Elizabethan London. A comic time travel novel from 1904.
Anthony Rogers is trapped in a mine by radioactive gas and wakes up 492 years later in a conquered America. The short novel that introduced Buck Rogers.
A young offender is recruited into a secret project that sends agents back to the Bronze Age. They are hunting for the source of technology no human could have built.
Martian cylinders land in the English countryside and their tripods march on London. The original alien invasion novel, told by a man trying to get home.
Published in 1898 as an answer to The War of the Worlds. Thomas Edison builds a fleet of spaceships and Earth carries the war back to Mars. Includes the original illustrations.
The complete trilogy in one volume. A sabotaged expedition discovers a civilization inside the Moon, and its rulers go on to conquer and occupy the Earth for centuries.
Explorers in a hidden Himalayan valley find a living city made of thinking metal shapes. It is an alien intelligence that could replace humanity if it ever leaves.
These science fiction novels run from Frankenstein in 1818 to the start of the space age. If the lost worlds were your favorite part, try our adventure novels.
