diff --git a/changelog_unreleased/misc/19538.md b/changelog_unreleased/misc/19538.md
new file mode 100644
index 000000000..37875a14f
--- /dev/null
+++ b/changelog_unreleased/misc/19538.md
@@ -0,0 +1,20 @@
+#### Handle Unicode zero-width marks in string width (#19538 by @TheAlexLichter)
+
+Prettier now treats Unicode nonspacing and enclosing marks as zero-width when measuring lines.
+
+<!-- prettier-ignore -->
+```js
+// Input
+moment.updateLocale("bo", { monthsShort: "ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢".split("_") });
+
+// Prettier stable
+moment.updateLocale("bo", {
+  monthsShort:
+    "ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢".split("_"),
+});
+
+// Prettier main
+moment.updateLocale("bo", {
+  monthsShort: "ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢".split("_"),
+});
+```
diff --git a/src/utilities/get-string-width.js b/src/utilities/get-string-width.js
index d5618e769..951846653 100644
--- a/src/utilities/get-string-width.js
+++ b/src/utilities/get-string-width.js
@@ -8,6 +8,8 @@ import {
 import { isNarrowEmojiCharacter } from "narrow-emojis";
 
 const notAsciiRegex = /[^\x20-\x7F]/;
+// Exclude [`Spacing Mark`](https://www.compart.com/en/unicode/category/Mc) because spacing marks contribute horizontal width.
+const zeroWidthMarkRegex = /[\p{Nonspacing_Mark}\p{Enclosing_Mark}]/u;
 
 // Similar to https://github.com/sindresorhus/string-width
 // We don't strip ansi, always treat ambiguous width characters as having narrow width.
@@ -42,13 +44,8 @@ function getStringWidth(text) {
       continue;
     }
 
-    // Ignore combining characters
-    if (codePoint >= 0x300 && codePoint <= 0x36f) {
-      continue;
-    }
-
-    // Ignore Variation Selectors
-    if (codePoint >= 0xfe00 && codePoint <= 0xfe0f) {
+    // Ignore zero-width marks, including combining marks and variation selectors
+    if (zeroWidthMarkRegex.test(character)) {
       continue;
     }
 
diff --git a/tests/format/js/string-width/__snapshots__/format.test.js.snap b/tests/format/js/string-width/__snapshots__/format.test.js.snap
new file mode 100644
index 000000000..bccd85914
--- /dev/null
+++ b/tests/format/js/string-width/__snapshots__/format.test.js.snap
@@ -0,0 +1,28 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`string-width.js format 1`] = `
+====================================options=====================================
+parsers: ["babel", "flow", "typescript"]
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+should___fit_____________("ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢");
+should_break_____________("ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢ ");
+
+// https://github.com/react/react/blob/06b2a50f321502514443f675eaa44be8ae826218/fixtures/fizz/src/BigComponent.js#L154
+should___fit_____("यह Google अनुवाद में अंग्रेज़ी से दूसरी भाषा में अनुवादित टेक्स्ट ब्लॉक है।");
+should_break_____("यह Google अनुवाद में अंग्रेज़ी से दूसरी भाषा में अनुवादित टेक्स्ट ब्लॉक है। ");
+
+=====================================output=====================================
+should___fit_____________("ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢");
+should_break_____________(
+  "ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢ ",
+);
+
+// https://github.com/react/react/blob/06b2a50f321502514443f675eaa44be8ae826218/fixtures/fizz/src/BigComponent.js#L154
+should___fit_____("यह Google अनुवाद में अंग्रेज़ी से दूसरी भाषा में अनुवादित टेक्स्ट ब्लॉक है।");
+should_break_____(
+  "यह Google अनुवाद में अंग्रेज़ी से दूसरी भाषा में अनुवादित टेक्स्ट ब्लॉक है। ",
+);
+
+================================================================================
+`;
diff --git a/tests/format/js/string-width/format.test.js b/tests/format/js/string-width/format.test.js
new file mode 100644
index 000000000..67c251cce
--- /dev/null
+++ b/tests/format/js/string-width/format.test.js
@@ -0,0 +1 @@
+runFormatTest(import.meta, ["babel", "flow", "typescript"]);
diff --git a/tests/format/js/string-width/string-width.js b/tests/format/js/string-width/string-width.js
new file mode 100644
index 000000000..1af3e7c9b
--- /dev/null
+++ b/tests/format/js/string-width/string-width.js
@@ -0,0 +1,6 @@
+should___fit_____________("ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢");
+should_break_____________("ཟླ་༡_ཟླ་༢_ཟླ་༣_ཟླ་༤_ཟླ་༥_ཟླ་༦_ཟླ་༧_ཟླ་༨_ཟླ་༩_ཟླ་༡༠_ཟླ་༡༡_ཟླ་༡༢ ");
+
+// https://github.com/react/react/blob/06b2a50f321502514443f675eaa44be8ae826218/fixtures/fizz/src/BigComponent.js#L154
+should___fit_____("यह Google अनुवाद में अंग्रेज़ी से दूसरी भाषा में अनुवादित टेक्स्ट ब्लॉक है।");
+should_break_____("यह Google अनुवाद में अंग्रेज़ी से दूसरी भाषा में अनुवादित टेक्स्ट ब्लॉक है। ");
diff --git a/tests/integration/__tests__/public-utilities.js b/tests/integration/__tests__/public-utilities.js
index 8a5c06fe1..9155d7150 100644
--- a/tests/integration/__tests__/public-utilities.js
+++ b/tests/integration/__tests__/public-utilities.js
@@ -71,9 +71,7 @@ test("sharedUtil.getStringWidth", () => {
   expect(getStringWidth("\u{2194}\u{FE0F}")).toBe(2);
   expect(getStringWidth("\u{1F469}")).toBe(2);
   expect(getStringWidth("\u{1F469}\u{1F3FF}")).toBe(2);
-  // Ideally this should be `2`, switch to use `Intl.Segmenter` will fix it
-  // https://github.com/prettier/prettier/pull/14793#discussion_r1185840038
-  expect(getStringWidth("\u{845B}\u{E0100}")).toBe(3);
+  expect(getStringWidth("\u{845B}\u{E0100}")).toBe(2);
 
   expect(getStringWidth(String.fromCharCode(0))).toBe(0);
   expect(getStringWidth(String.fromCharCode(31))).toBe(0);
@@ -82,6 +80,10 @@ test("sharedUtil.getStringWidth", () => {
   expect(getStringWidth(String.fromCharCode(159))).toBe(0);
   expect(getStringWidth("\u001B")).toBe(0);
   expect(getStringWidth("x\u0300")).toBe(1);
+  expect(getStringWidth("ཟླ")).toBe(1);
+  expect(getStringWidth("a\u20DD")).toBe(1);
+  expect(getStringWidth("\u093E")).toBe(1);
+  expect(getStringWidth("\u0915\u093E")).toBe(2);
 
   expect(getStringWidth("👶")).toBe(2);
   expect(getStringWidth("👶🏽")).toBe(2);