Most Popular Hard Science Fiction Books of the 2020s
Discover popular Hard Science Fiction books from the 2020s, with reader ratings and new favorites to explore.
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Books in this list
Exiles War #1
Fleet of the Forgotten
Science Fiction · Hard Science Fiction · Military Science Fiction · Space Opera
November 6, 2025
Codex Ananta #1
Eternal
Science Fiction · Hard Science Fiction
August 29, 2025
Undying Mercenaries #24
Demon World
Science Fiction · Hard Science Fiction · Space Opera
August 17, 2025
Undying Mercenaries #21
Throne World
Science Fiction · Hard Science Fiction · Space Opera
April 27, 2024
Undying Mercenaries #20
Crystal World
Science Fiction · Hard Science Fiction · Space Opera
October 14, 2023
Rich Man's Sky #2
Poor Man's Sky
Science Fiction · Hard Science Fiction
January 3, 2023
The Mountain in the Sea
Science Fiction · Anthropological SF · Hard Science Fiction
October 4, 2022
Epic of Atlantis #1
Echoes of Time
Science Fiction · Hard Science Fiction
November 1, 2025
The Icarus Series #2
The Icarus Twin
Science Fiction · Hard Science Fiction · Space Opera
December 5, 2023
Braking Day
Science Fiction · Hard Science Fiction
April 5, 2022
The Icarus Series #1
The Icarus Plot
Science Fiction · Hard Science Fiction · Space Opera
July 5, 2022
The Delivery
Science Fiction · Hard Science Fiction · Psychological Thriller · Suspense Thriller · Thriller
July 1, 2026
Observer
Science Fiction · Hard Science Fiction
September 16, 2024
Caine Riordan #6
Endangered Species
Science Fiction · Hard Science Fiction · Space Opera
August 1, 2023
Multiverses: An Anthology of Alternate Realities
Science Fiction · Dystopia · Hard Science Fiction · Post-Apocalyptic · Social Science Fiction
April 10, 2023
Service Model
Science Fiction · Hard Science Fiction · Post-Apocalyptic
June 4, 2024
Generation Ship
Science Fiction · Hard Science Fiction
October 17, 2023
Merchants of Light #2
Merchants of Light Book 2
Science Fiction · Hard Science Fiction
2027
Undying Mercenaries #27
Undying Mercenaries Book 27
Science Fiction · Hard Science Fiction · Space Opera
2027
Rich Man's Sky #5
Rich Man's Sky Book 5
Science Fiction · Hard Science Fiction
2027
Exiles War #2
Exiles War Book 2
Science Fiction · Hard Science Fiction · Military Science Fiction · Space Opera
2027
Kallipolis Series #2
Kallipolis Series Book 2
Science Fiction · Hard Science Fiction
2027
Merchants of Light #1
Faster Than Light
Science Fiction · Hard Science Fiction
November 8, 2026
The Nibelung series #3
Royal Scout
Science Fiction · Hard Science Fiction
October 13, 2026
Epic of Atlantis #4
Echoes of the Void
Science Fiction · Hard Science Fiction
August 18, 2026
Epic of Atlantis #3
Echoes of the Fall
Science Fiction · Hard Science Fiction
February 13, 2026
The Language of Liars
Science Fiction · Hard Science Fiction · Novella
April 21, 2026
Galaxy Raiders #2
Battlestorm
Science Fiction · Hard Science Fiction · Military Science Fiction · Space Opera
May 5, 2026
Bionic Frontier #2
The Sands of Mars
Science Fiction · Hard Science Fiction
September 1, 2026
Relic Wars #1
The Signal Beneath the Sand
Science Fiction · Hard Science Fiction
April 14, 2026
Ballistic #2
Apogee
Science Fiction · Hard Science Fiction · Thriller
March 3, 2026
Plausibly Deniable
Science Fiction · Cyberpunk · Hard Science Fiction · Military Science Fiction · Space Opera
March 3, 2026
Gothic Fantasy
Wars in the Stars Short Stories
Science Fiction · Hard Science Fiction · Military Science Fiction · Space Opera · Anthology
October 20, 2026
Undying Mercenaries #26
Spawn World
Science Fiction · Hard Science Fiction · Space Opera
September 19, 2026
The Europa Protocol #2
I Thought Charlie Was Gone?
Science Fiction · Hard Science Fiction
January 19, 2026
The Europa Protocol #1
Graveyard Shift on Europa
Science Fiction · Hard Science Fiction
January 12, 2026