Isaiah 9 is the ninth chapter of the Book of Isaiah in the Hebrew Bible or the Old Testament of the Christian Bible. This book contains the prophecies attributed to the prophet Isaiah, and is one of the Nevi'im.

The original text was written in Hebrew language. This chapter is divided into 21 verses in Christian Bibles, but 20 verses in the Hebrew Bible with the following verse numbering comparison:

This article generally follows the common numbering in Christian English Bible versions, with notes to the numbering in Hebrew Bible versions.

Some early manuscripts containing the text of this chapter in Hebrew are of the Masoretic Text tradition, which includes the Codex Cairensis (895), the Petersburg Codex of the Prophets (916), Aleppo Codex (10th century), Codex Leningradensis (1008).

Fragments containing parts of this chapter were found among the Dead Sea Scrolls (3rd century BC or later):

There is also a translation into Koine Greek known as the Septuagint, made in the last few centuries BCE. Extant ancient manuscripts of the Septuagint version include Codex Vaticanus (B; ${\displaystyle {\mathfrak {G}}}$^B; 4th century), Codex Sinaiticus (S; BHK: ${\displaystyle {\mathfrak {G}}}$^S; 4th century), Codex Alexandrinus (A; ${\displaystyle {\mathfrak {G}}}$^A; 5th century) and Codex Marchalianus (Q; ${\displaystyle {\mathfrak {G}}}$^Q; 6th century).

The parashah sections listed here are based on the Aleppo Codex. Isaiah 9 is a part of the Prophecies about Judah and Israel (Isaiah 1-12). {P}: open parashah; {S}: closed parashah; using Hebrew Bible verse numbering:

For is there no gloom to her that was stedfast? Now the former hath lightly afflicted the land of Zebulun and the land of Naphtali, but the latter hath dealt a more grievous blow by the way of the sea, beyond the Jordan, in the district of the nations.