r/sciencefiction is a subreddit with 315k members. The most common kinds of discussions are advice requests and self-promotion, and the community frequently discusses scifi, worst, sci fi, science fiction, 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
Advice Requests
: "What book did you initially abandon, only to return years later and love?"
7 posts
#2
Self-Promotion
: "[Self-Promo] An excerpt from my debut military sci-fi novel, First to Fight"
2 posts
#3
Solution Requests
: "Help finding a book"
1 post
#4
Ideas
: "TITLE: I got tired of fandom wikis, so I've been writing descriptions of 141 sci-fi planets — from Arrakis to Solaris to Rakhat"
1 post
Popular Topics in r/sciencefiction
#1
Scifi
23 posts
#2
Worst
21 posts
#3
Sci Fi
19 posts
#4
Science Fiction
10 posts
#5
Tired
9 posts
#6
Looking For A Short Story
9 posts
#7
Book
8 posts
#8
Annoying
7 posts
#9
Looking For A Book
7 posts
#10
Series
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(14.1%)
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About
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This page gives a focused view of r/sciencefiction, including current member size, discussion patterns, product reviews, and related communities to explore.
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Last updated: August 29, 2026