diff --git a/intl/locale/language.properties b/intl/locale/language.properties
index b62bafd5c0ef..2f40d20aa53d 100644
--- a/intl/locale/language.properties
+++ b/intl/locale/language.properties
@@ -229,6 +229,7 @@ ru.accept     = true
 ru-md.accept  = true
 rw.accept     = true
 sa.accept     = true
+sat.accept    = true
 sc.accept     = true
 sco.accept    = true
 sd.accept     = true
diff --git a/python/mozbuild/mozbuild/action/langpack_localeNames.json b/python/mozbuild/mozbuild/action/langpack_localeNames.json
index 9014c7717a11..4e81a4c6dcbd 100644
--- a/python/mozbuild/mozbuild/action/langpack_localeNames.json
+++ b/python/mozbuild/mozbuild/action/langpack_localeNames.json
@@ -326,6 +326,10 @@
     "english": "Russian",
     "native": "Русский"
   },
+  "sat": {
+    "english": "Santali",
+    "native": "ᱥᱟᱱᱛᱟᱲᱤ"
+  },
   "sc": {
     "english": "Sardinian",
     "native": "Sardu"
diff --git a/toolkit/components/mozintl/mozIntl.sys.mjs b/toolkit/components/mozintl/mozIntl.sys.mjs
index 395a20dab73d..3c497c64cbde 100644
--- a/toolkit/components/mozintl/mozIntl.sys.mjs
+++ b/toolkit/components/mozintl/mozIntl.sys.mjs
@@ -588,6 +588,7 @@ const availableLocaleDisplayNames = {
     "ru",
     "rw",
     "sa",
+    "sat",
     "sc",
     "sco",
     "sd",
@@ -735,6 +736,7 @@ const nativeLocaleNames = new Map(
     rm: "Rumantsch",
     ro: "Română",
     ru: "Русский",
+    sat: "ᱥᱟᱱᱛᱟᱲᱤ",
     sc: "Sardu",
     sco: "Scots",
     si: "සිංහල",
diff --git a/toolkit/locales/en-US/toolkit/intl/languageNames.ftl b/toolkit/locales/en-US/toolkit/intl/languageNames.ftl
index b6baec4c17bd..a7d76b7d989f 100644
--- a/toolkit/locales/en-US/toolkit/intl/languageNames.ftl
+++ b/toolkit/locales/en-US/toolkit/intl/languageNames.ftl
@@ -158,6 +158,7 @@ language-name-ro = Romanian
 language-name-ru = Russian
 language-name-rw = Kinyarwanda
 language-name-sa = Sanskrit
+language-name-sat = Santali
 language-name-sc = Sardinian
 language-name-sco = Scots
 language-name-sd = Sindhi