Rule 34 is an internet meme that states "If it exists, there is porn of it. No exceptions."
Rule 34 may also refer to:
- Rule 34 (novel), a novel by Charles Stross
- Rule 34 of the Federal Rules of Civil Procedure, which governs requests for production of documents
- Rule 34, the Wolfram code for a particular elementary cellular automaton
- Rule 34 (film), a 2022 drama directed by Julia Murat and starring Sol Miranda
See also
- The 34th Rule, a 1999 Star Trek: Deep Space Nine novel