r/scifi is a subreddit with 4.5M members. The most common kinds of discussions are advice requests and self-promotion, and the community frequently discusses scifi, sci fi, books, book, and worst, and they frequently recommend/review sci-fi books, sci-fi literature, and sci-fi novels.
Welcome to r/scifi, a home for all things science fiction, the heart of speculative fiction.
Join the discussion about your favorite books, authors, movies, shows, comics, and games — anything with a touch of science and imagination.
Popular Themes in r/scifi
#1
Advice Requests
: "What’s one Sci-Fi mystery you wish was never explained?"
19 posts
#2
Self-Promotion
: "Thought this sub might like some of my recent illustrations"
2 posts
#3
Pain & Anger
: "Heaven’s River Was So Bad It Made Me Drop the Bobiverse"
1 post
#4
Ideas
: "[SPS] I made LEGO Interstellar Bookends for LEGO Ideas!"
1 post
Popular Topics in r/scifi
#1
Scifi
31 posts
#2
Sci Fi
24 posts
#3
Books
20 posts
#4
Book
15 posts
#5
Worst
14 posts
#6
Struggling
13 posts
#7
Hate
13 posts
#8
Movies
12 posts
#9
Annoying
10 posts
#10
Space
10 posts
Products Discussed in r/scifi
Sci-fi Books
588 reviews
#1
Adrian Tchaikovsky
4.7★ from 14 reviews
#2
Iain M. Banks
4.9★ from 11 reviews
#3
Andy Weir
4.8★ from 11 reviews
Sci-fi Literature
142 reviews
#1
Isaac Asimov
4.8★ from 5 reviews
#2
Orson Scott Card
4.8★ from 4 reviews
#3
Frank Herbert
4.5★ from 4 reviews
Sci-fi Novels
96 reviews
#1
Alastair Reynolds
4.7★ from 7 reviews
#2
Jack McDevitt
4.7★ from 3 reviews
#3
Stephen Baxter
4.7★ from 3 reviews
Flair Used in r/scifi
#1
Recommendations
: "Pacific Rim, worth a revisit?"
57 posts
#2
Print
: "Found these beautiful 70’s Science Fiction Monthly magazines"
30 posts
#3
General
: "Wouldn't micro collisions make high speed space travel prohibitively dangerous?"
30 posts
#4
Films
: "Dark City - 1998"
26 posts
#5
Original Content
: "Thought this sub might like some of my recent illustrations"
22 posts
#6
TV
: "Still get fired up decades later after hearing EJO’s improvised speech."
19 posts
#7
Art
: "[SPS] I made LEGO Interstellar Bookends for LEGO Ideas!"
7 posts
#8
ID This
: "Somebody’s gotta help me with this show, because I can’t remember it’s name and it’s been vexing me for many years…"
6 posts
#9
Games
: "Best setting for a space battle?"
2 posts
#10
Community
: "How does sci-fi tackle the G-Forces required to quickly accelerate to and from any appreciable fraction of light speed?"
1 post
Member Growth in r/scifi
Yearly
+72k members(1.6%)
Similar Subreddits to r/scifi
r/aivideo
391k members
44.4% / yr
r/BooksThatFeelLikeThis
380k members
49.2% / yr
r/kanpur
24k members
65.8% / yr
r/Lovecraft
283k members
7.1% / yr
r/printSF
363k members
6.5% / yr
r/sciencefiction
316k members
14.2% / yr
r/scifi_bookclub
21k members
25.7% / yr
r/SciFiStories
1k members
39.2% / yr
r/scifiwriting
109k members
17.7% / yr
r/whatsthemoviecalled
98k members
28.5% / 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/scifi, 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 6, 2026