Folio may refer to:

  • Folio (printing), a book size
  • A particular edition of a book printed on folio pages, such as the First Folio of William Shakespeare's plays
  • A leaf of a book: see Recto and verso
  • Folio (typeface), a sans-serif typeface
  • Folio (magazine)
  • Foolscap folio, a paper size
  • Folio Society, publishers of fine illustrated books
  • Folio Weekly, a newspaper published in Florida and Georgia
  • "Folio", an imprint of French publisher Éditions Gallimard
  • Folio Corporation, a software company and technology product
  • Folio, Inc. (acquired by Sun Microsystems), developers of the F3 font format