Pseudepigrapha (also anglicized as "pseudepigraph" or "pseudepigraphs") are falsely attributed works, texts whose claimed author is not the true author, or a work whose real author attributed it to a figure of the past, called generically a pseudo-author and specifically Pseudo-Name, prefixing the author's name with the particle "pseudo-".

In biblical studies, the term pseudepigrapha can refer to an assorted collection of Jewish religious works thought to be written c. 300 BC to 300 AD. They are distinguished by Protestants from the deuterocanonical books (Catholic and Orthodox) or Apocrypha (Protestant), the books that appear in extant copies of the Septuagint in the fourth century or later and the Vulgate, but not in the Hebrew Bible or in Protestant Bibles. The Catholic Church distinguishes only between the deuterocanonical and all other books; the latter are called biblical apocrypha, which in Catholic usage includes the pseudepigrapha. In addition, two books considered canonical in the Orthodox Tewahedo churches, the Book of Enoch and Book of Jubilees, are categorized as pseudepigrapha from the point of view of Chalcedonian Christianity.

In addition to the sets of generally agreed to be non-canonical works, scholars will also apply the term to canonical works who make a direct claim of authorship, yet this authorship is doubted. For example, the Book of Daniel is considered by some to have been written in the 2nd century BC, 400 years after the prophet Daniel lived, and thus for them, the work is pseudepigraphic. A New Testament example might be the book of 2 Peter, considered by some to be written approximately 80 years after Saint Peter's death. Early Christians, such as Origen, harbored doubts as to the authenticity of the book's authorship.

The term has also been used by Quranists to describe hadiths, which are not accepted by Quranists; who claim that most hadiths are fabrications, created in the 8th and 9th century AD, and are falsely attributed to the Islamic prophet Muhammad.