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

Look up octavo in Wiktionary, the free dictionary.

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

• Octave
• Octavio

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