Isaiah 20 is the twentieth 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.

The original text was written in Hebrew language. This chapter is divided into 6 verses.

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).

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 20 is a part of the Prophecies about the Nations (Isaiah 13–23). {P}: open parashah; {S}: closed parashah.

 This article incorporates text from a publication now in the public domain: Easton, Matthew George (1897). "Tartan". Easton's Bible Dictionary (New and revised ed.). T. Nelson and Sons.