r/sciencefiction is a subreddit with 312k members. The most common kinds of discussions are advice requests and self-promotion, and the community frequently discusses scifi, sci fi, worst, tired, and looking for a short story, and they frequently recommend/review sci-fi books, science fiction books, and science fiction.
This reddit is for fans and creators of Science Fiction and related media in any form. SF topics should involve plausible ideas reached through the rational application of science. General speculative fiction posts are fine as long as they primarily focus on Science Fiction.
Popular Themes in r/sciencefiction
#1
Advice Requests
: "Thinking about reading The Book of the New Sun by Gene Wolfe? Where does it place amongst the best sci-fi novels? Is it worth the read?"
7 posts
#2
Self-Promotion
: "I am Jeremy Szal, author of the Common Saga - Ask me Anything!"
2 posts
#3
Solution Requests
: "Help finding show"
1 post
#4
Ideas
: "I'm writing an encounter with a rogue AI that lures cargo spaceships into a trap, just to turn them into art installations. Looking for ideas on how it creates them."
1 post
#5
Money Talk
: "Humble Blade Runner Collection Review: A Cyberpunk Comic Bundle Worth Every Dollar"
1 post
Popular Topics in r/sciencefiction
#1
Scifi
23 posts
#2
Sci Fi
: "Sci Fi sources of starship propulsion power, systems power generation, and destructive power? (Star Trek and beyond)"
23 posts
#3
Worst
15 posts
#4
Tired
9 posts
#5
Looking For A Short Story
9 posts
#6
Book
8 posts
#7
Annoying
7 posts
#8
Looking For A Book
7 posts
#9
Series
7 posts
#10
Hate
6 posts
Products Discussed in r/sciencefiction
Sci-fi Books
150 reviews
#1
Robert A. Heinlein
4.6★ from 14 reviews
#2
Isaac Asimov
4.8★ from 9 reviews
#3
Orson Scott Card
5.0★ from 8 reviews
Science Fiction Books
102 reviews
#1
Arthur C. Clarke
5.0★ from 5 reviews
#2
Frank Herbert
5.0★ from 4 reviews
#3
Andy Weir
5.0★ from 4 reviews
Science Fiction
51 reviews
#1
Martha Wells
5.0★ from 4 reviews
#2
Andy Weir
4.7★ from 3 reviews
#3
Adrian Tchaikovsky
5.0★ from 3 reviews
Flair Used in r/sciencefiction
#1
AMA
: "I am Jeremy Szal, author of the Common Saga - Ask me Anything!"
1 post
Member Growth in r/sciencefiction
Yearly
+38k members(14.0%)
Similar Subreddits to r/sciencefiction
r/FictionWriting
29k members
59.2% / yr
r/KeepWriting
263k members
8.8% / yr
r/KindleUnlimited
42k members
45.7% / yr
r/printSF
361k members
6.5% / yr
r/ScienceFictionBooks
30k members
75.5% / yr
r/scifi
4.5M members
1.4% / yr
r/scifi_bookclub
20k members
23.2% / yr
r/scifiwriters
901 members
5.4% / yr
r/scifiwriting
107k members
18.0% / yr
r/writing
3.4M members
6.5% / yr
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/sciencefiction, including current member size, discussion patterns, product reviews, and related communities to explore.
This data is synced periodically so insights stay current and useful for ongoing research.
Last updated: July 28, 2026