False Folio is the term that Shakespeare scholars and bibliographers have applied to William Jaggard's printing of ten Shakespearean and pseudo-Shakespearean plays together in 1619, the first attempt to collect Shakespeare's work in a single volume. The only complete extant copy is part of the collection of the Folger Shakespeare Library in Washington, DC.
The term "false folio" intentionally evokes the folio collections of Shakespeare's works that appeared later: the First Folio of 1623 and its three seventeenth-century successors. The description "folio" is not strictly accurate, since the ten plays were printed in a larger-than-usual quarto format, not in folio; but the key qualifier is false folio. The texts in question were first examined with modern bibliographic procedures primarily by Alfred W. Pollard, W. W. Greg, and William J. Neidig. Pollard provides a detailed account in his Shakespeare Folios and Quartos.
In summary, the stationer and printer William Jaggard reprinted ten plays in 1619, either to be bound together in a single volume or issued separately depending on customer choice. Jaggard, however, did not have clear title to all of the plays involved [see: Stationers Company; Stationers' Register], and therefore he printed some of the texts with false dates and the names of the original stationers involved on the title pages – in effect reproducing the appearance of the earlier quartos. The ten plays were:
Pericles was printed after The Whole Contention, since their signatures (the alphanumeric designations of the quires in sequence) run together; but the nine plays were apparently bound together in no particular order. (The few existing collections vary.)