Isaiah was an 8th-century BC Israelite prophet after whom the Book of Isaiah is named. The exact relationship between the Book of Isaiah and the actual prophet Isaiah is complicated. The traditional view is that all 66 chapters of the book of Isaiah were written by one man, Isaiah, possibly in two periods between 740 BC and c. 686 BC, separated by approximately 15 years. Another widely held view is that parts of the first half of the book (chapters 1–39) originated with the historical prophet, interspersed with prose commentaries written in the time of King Josiah 100 years later, and that the remainder of the book dates from immediately before and immediately after the end of the exile in Babylon, almost two centuries after the time of the historical prophet, and perhaps these later chapters represent the work of an ongoing school of prophets who prophesied in ... .

Isaiahs prophecies include many things about the Saviors life and Second Coming. For example, Isaiah wrote that a Son would be given to us and be called Immanuel, which means "God is with us.". Isaiah also predicted that three branches of Gods people will live into a millennial age of peace.

Isaiahs prophecies are interpreted by Christians as being about the Messiah Jesus Christ. Many of Isaiahs prophecies have found fulfillment with the worldwide dispersion of Jews, the worldwide persecution of Jews, the recent worldwide migration of Jews back to Israel during the past century, the recent re-establishment and restoration of Israel, and the worldwide impact that Jews have had on the world.

Isaiahs prophecies include both terrifying warnings of judgment and destruction and uplifting promises of hope and prosperity. Isaiahs use of metaphors, allegories, codenames, keywords, etc., often requires both a literal and figurative interpretation.