r/sciencefiction is a subreddit with 314k members. The most common kinds of discussions are self-promotion and advice requests, and the community frequently discusses scifi, sci fi, worst, hate, and tired, 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
Self-Promotion
: "[Self-promo] Almost a year after its initial conception, my sci-fi/ fantasy book is real!"
8 posts
#2
Advice Requests
: "Finished the entire Three-Body Problem trilogy — what should I read next?"
6 posts
#3
Solution Requests
: "Looking for readers interested in a sci-fi novel set between Riyadh and London"
2 posts
Popular Topics in r/sciencefiction
#1
Scifi
23 posts
#2
Sci Fi
17 posts
#3
Worst
15 posts
#4
Hate
10 posts
#5
Tired
9 posts
#6
Looking For A Short Story
9 posts
#7
Book
8 posts
#8
Sci Fi
7 posts
#9
Annoying
7 posts
#10
Looking For A Book
7 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
Member Growth in r/sciencefiction
Yearly
+39k members(14.0%)
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About
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Last updated: August 14, 2026