r/scifi is a subreddit with 4.5M members. The most common kinds of discussions are advice requests and self-promotion, and the community frequently discusses sci fi, scifi, books, book, and space, and they frequently recommend/review sci-fi books, sci-fi literature, and sci-fi novels.
Welcome to r/scifi, a home for all things science fiction, the heart of speculative fiction.
Join the discussion about your favorite books, authors, movies, shows, comics, and games — anything with a touch of science and imagination.
Popular Themes in r/scifi
#1
Advice Requests
: "Sci-fi writer H P Lovecraft signed book need help on rarity or historical value , tell me I’m not crazy that this is as low valued as people say. Any insight would be helpful"
20 posts
#2
Self-Promotion
: "I’d like to share some pages for a retro future inspired comic I’m making"
7 posts
#3
Pain & Anger
: "Finished Battlestar Galactica and 3rd season of The Expanse, so far, for me, these are the pinnacle of scifi TV shows (No spoilers for The Expanse beyond 3rd season please)"
2 posts
#4
Solution Requests
: "Trying to find a sci-fi series about the first jump drive ship gets lost"
1 post
#5
Ideas
: "If you could decide the next major production sci-fi movie, what would it be?"
1 post
#6
News
: "An Inside Look at 'Star Trek IV: The Voyage Home' As It Celebrates 40 Years"
1 post
Popular Topics in r/scifi
#1
Sci Fi
: "Top 5-10 Most powerful Vessels/Vehicles in Sci Fi, Greenships from Xeelee Sequence"
162 posts
#2
Scifi
: "What are your favorite armor/suits in all of Scifi?"
102 posts
#3
Books
: "Just finished reading Cixin’s “The Dark Forest”, the sequel to “Three Body Problem”… I desperately need to discuss it since no one else in my life has read it"
45 posts
#4
Book
: "You’re in a Book club where no one has read sci-fi. What’s your Book selection?"
41 posts
#5
Space
: "Graviton Nomad (original Spaceship) & Artwork"
36 posts
#6
Movies
: "Looking for some lesser known sci-fi Movies outside of Netflix’s usual catalog hidden gems, cult favorites, or underrated films with unique concepts and a good atmosphere"
32 posts
#7
Movie
: "I decided to watch Evolution for the first in years because I needed a laugh and it's still funny. It is a great Movie if you want a lighthearted but funny scifi film to watch."
27 posts
#8
Series
: "Any Series Where Humans Move to Another Planet for Survival?"
17 posts
#9
Worst
14 posts
#10
Struggling
13 posts
Products Discussed in r/scifi
Sci-fi Books
588 reviews
#1
Adrian Tchaikovsky
4.7★ from 14 reviews
#2
Iain M. Banks
4.9★ from 11 reviews
#3
Andy Weir
4.8★ from 11 reviews
Sci-fi Literature
142 reviews
#1
Isaac Asimov
4.8★ from 5 reviews
#2
Orson Scott Card
4.8★ from 4 reviews
#3
Frank Herbert
4.5★ from 4 reviews
Sci-fi Novels
96 reviews
#1
Alastair Reynolds
4.7★ from 7 reviews
#2
Jack McDevitt
4.7★ from 3 reviews
#3
Stephen Baxter
4.7★ from 3 reviews
Flair Used in r/scifi
#1
Recommendations
: "Planing a marathon, any suggestions?"
51 posts
#2
Original Content
: "The 'Big Bang' Goes Sci-Fi with 'Stuart Fails to Save the Universe' (Exclusive)"
30 posts
#3
Films
: "Starship Troopers reboot"
27 posts
#4
General
: "Why isn’t Planetes discussed more in sci-fi circles?"
26 posts
#5
TV
: "Amazon has canceled their planned Stargate rebot"
26 posts
#6
Print
: "I just finished All Tomorrows a few days ago and boy is it grim."
22 posts
#7
Games
: "Is War Hammer 40k the worst sci-fi universe to be a part of?"
5 posts
#8
Art
: "I’d like to share some pages for a retro future inspired comic I’m making"
5 posts
#9
ID This
: "Trying to find a sci-fi series about the first jump drive ship gets lost"
5 posts
#10
Community
: "Which Sci-fi military leader gets your vote?"
2 posts
Member Growth in r/scifi
Yearly
+54k members(1.2%)
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About
GummySearch helps people research Reddit communities by organizing activity, growth, themes, and post-level signals into one place.
This page gives a focused view of r/scifi, including current member size, discussion patterns, product reviews, and related communities to explore.
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Last updated: June 15, 2026