r/sciencefiction is a subreddit with 309k members. The most common kinds of discussions are advice requests and self-promotion, and the community frequently discusses sci fi, series, fiction, scifi, and book, 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
: "Help. Looking for old sci fi movie"
16 posts
#2
Self-Promotion
: "Mania in the Machine - Out Now - Adult Sci-Fi Psychological Action Thriller"
3 posts
#3
Solution Requests
: "What website do you user for recommendations"
1 post
#4
Ideas
: "Was reading Harlan Ellison's "Repent, Harlequin!" Said the Ticktockman and thought "Wow, this would make an amazing animated movie!""
1 post
Popular Topics in r/sciencefiction
#1
Sci Fi
: "Help. Looking for old Sci Fi movie"
147 posts
#2
Series
: "The Boroughs is a good earth-based science fiction Series."
30 posts
#3
Fiction
: "[Promotion] The Wanderer: Hard Science Fiction from the Darkest Ocean"
25 posts
#4
Scifi
23 posts
#5
Book
: "Totally real Book covers for you to read"
22 posts
#6
Space
: "Is there any openly conservative/right-wing Space opera out there? (just curious and looking to investigate)"
20 posts
#7
Worst
15 posts
#8
Story
: "[OC] Gravit(a short Story, i wrote yesterday)"
15 posts
#9
Books
: "Best underrated/unknown sci-fi Books you've read?"
13 posts
#10
Novel
: "real numbers from my debut Novel after 40 days on Amazon — posting my actual KDP dashboard because I wish someone had shown me this before I published"
11 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
+37k members(13.7%)
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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/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: June 29, 2026