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"Nonexistent books" denotes a category made up of works that revolve around—or consist of—books that do not actually exist outside their own narrative or concept. This can mean fictional titles invoked inside novels (the imaginary manuals, lost diaries, or forbidden tomes characters cite), invented bibliographies and hoax texts, real-world projects that describe or reconstruct lost or never-completed manuscripts, or playful metafiction that treats an invented book as if it were real. Such a category highlights themes of authorship, authority, absence and desire, worldbuilding and the limits of text: the nonexistent book functions as a plot device, a satirical commentary, an archival fantasy, or a philosophical exploration of what a book is when it cannot be read. Whether used for humor, mystery, scholarship, or speculative fiction, "Nonexistent books" foregrounds how the idea of a book can be as influential as a physical object.

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