The Ascension of Isaiah is a pseudepigraphical Judeo-Christian text. Scholarly estimates regarding the date of the Ascension of Isaiah range from 70 AD to 175 AD. Many scholars believe it to be a compilation of several texts completed by an unknown Christian scribe who claimed to be the Prophet Isaiah, while an increasing number of scholars in recent years have argued that the work is a unity by a single author that may have utilized multiple sources.

Pseudepigrapha 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. The name of the author to whom the work is falsely attributed is often prefixed with the particle "pseudo-", such as for example "pseudo-Aristotle" or "pseudo-Dionysius": these terms refer to the anonymous authors of works falsely attributed to Aristotle and Dionysius the Areopagite, respectively.