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.

Robert Henry Charles, was an Irish Anglican theologian, biblical scholar, professor, and translator from Northern Ireland. He is known particularly for his English translations of numerous apocryphal and pseudepigraphal Ancient Hebrew writings, including the Book of Jubilees (1895), the Apocalypse of Baruch (1896), the Ascension of Isaiah (1900), the Book of Enoch (1906), and the Testaments of the Twelve Patriarchs (1908), which have been widely used. He wrote the articles in the eleventh edition of Encyclopædia Britannica (1911) attributed to the initials "R. H. C."