Octavo (disambiguation)

Octavo is a technical term describing the format of a book.

Octavo may also refer to:
 * pseudonym of Henri Julien (1852–1908), French Canadian artist
 * Octavo (Discworld), a grimoire in the Discworld series by Terry Pratchett
 * Octavo Corp., a company in Oakland, California, that publishes digital editions of rare books — see Rare Book Room