r/sciencefiction↗
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.
320k subscribers342 posts / mo in Sep 2026 (incl. <1% by known bots)257 authors / mosince 2010
r/sciencefiction has 320k members (+14% over the last 12 months). It gets about 342 posts a month from 257 people. Top topics: Sci-Fi Books, Free Sci-Fi Novels and Cyberpunk Fiction.
When to post on r/sciencefiction
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How r/sciencefiction has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/sciencefiction
Top topics
Share of the subreddit's posts
- Sci-Fi Books1.9%
- Free Sci-Fi Novels1.1%
- Cyberpunk Fiction0.9%
- Space Sci-Fi Books0.9%
- Jules Verne & Alien Adventures0.5%
Brands people mention
Most-mentioned brands and sites, last 12 months
- Goodreads
- Substack
- IMDb
- Royal Road
- Medium
Everything else about r/sciencefiction
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research