r/sciencefiction is a subreddit with 317k members. The most common kinds of discussions are advice requests and solution requests, and the community frequently discusses fiction, science fiction, scifi, sci fi, and worst, 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
: "Finished the entire Three-Body Problem trilogy — what should I read next?"
11 posts
#2
Solution Requests
: "Help finding a book"
2 posts
#3
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"
2 posts
#4
Self-Promotion
: "[Self-Promo] An excerpt from my debut military sci-fi novel, First to Fight"
2 posts
Popular Topics in r/sciencefiction
#1
Fiction
33 posts
#2
Science Fiction
33 posts
#3
Scifi
23 posts
#4
Sci Fi
17 posts
#5
Worst
15 posts
#6
Books
: "One Book, one Director. Go!"
13 posts
#7
Tired
9 posts
#8
Looking For A Short Story
9 posts
#9
Book
8 posts
#10
Annoying
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%)
Similar Subreddits to r/sciencefiction
r/books
27.3M members
1.4% / yr
r/FictionWriting
34k members
69.4% / yr
r/mealtimevideos
2.0M members
0.7% / yr
r/printSF
364k members
6.5% / yr
r/scifi
4.5M members
1.7% / yr
r/scifi_bookclub
21k members
26.5% / yr
r/sci_fi_podcast_fans
122 members
10.9% / yr
r/scifiwriting
109k members
17.3% / yr
r/writing
3.4M members
5.7% / yr
r/WritingWithAI
166k members
183.7% / 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: September 13, 2026