diff --git a/babel/messages/catalog.py b/babel/messages/catalog.py
index 67c542591..7e9b7af06 100644
--- a/babel/messages/catalog.py
+++ b/babel/messages/catalog.py
@@ -374,6 +374,8 @@ def _get_mime_headers(self):
         else:
             headers.append(('PO-Revision-Date', self.revision_date))
         headers.append(('Last-Translator', self.last_translator))
+        if self.locale is not None:
+            headers.append(('Language', str(self.locale)))
         if (self.locale is not None) and ('LANGUAGE' in self.language_team):
             headers.append(('Language-Team',
                            self.language_team.replace('LANGUAGE',
diff --git a/tests/messages/test_catalog.py b/tests/messages/test_catalog.py
index aac71eeac..31bb1d140 100644
--- a/tests/messages/test_catalog.py
+++ b/tests/messages/test_catalog.py
@@ -380,6 +380,7 @@ def test_catalog_mime_headers_set_locale():
         ('POT-Creation-Date', '1990-04-01 15:30+0000'),
         ('PO-Revision-Date', '1990-08-03 12:00+0000'),
         ('Last-Translator', 'John Doe <jd@example.com>'),
+        ('Language', 'de_DE'),
         ('Language-Team', 'de_DE <de@example.com>'),
         ('Plural-Forms', 'nplurals=2; plural=(n != 1)'),
         ('MIME-Version', '1.0'),
diff --git a/tests/messages/test_frontend.py b/tests/messages/test_frontend.py
index 882cb00d3..4d26df50e 100644
--- a/tests/messages/test_frontend.py
+++ b/tests/messages/test_frontend.py
@@ -359,6 +359,7 @@ def test_with_output_dir(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: en_US\n"
 "Language-Team: en_US <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n != 1)\n"
 "MIME-Version: 1.0\n"
@@ -409,6 +410,7 @@ def test_keeps_catalog_non_fuzzy(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: en_US\n"
 "Language-Team: en_US <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n != 1)\n"
 "MIME-Version: 1.0\n"
@@ -459,6 +461,7 @@ def test_correct_init_more_than_2_plurals(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: lv_LV\n"
 "Language-Team: lv_LV <LL@li.org>\n"
 "Plural-Forms: nplurals=3; plural=(n%%10==1 && n%%100!=11 ? 0 : n != 0 ? 1 :"
 " 2)\n"
@@ -511,6 +514,7 @@ def test_correct_init_singular_plural_forms(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: ja_JP\n"
 "Language-Team: ja_JP <LL@li.org>\n"
 "Plural-Forms: nplurals=1; plural=0\n"
 "MIME-Version: 1.0\n"
@@ -568,6 +572,7 @@ def test_supports_no_wrap(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: en_US\n"
 "Language-Team: en_US <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n != 1)\n"
 "MIME-Version: 1.0\n"
@@ -626,6 +631,7 @@ def test_supports_width(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: en_US\n"
 "Language-Team: en_US <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n != 1)\n"
 "MIME-Version: 1.0\n"
@@ -884,6 +890,7 @@ def test_init_with_output_dir(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: en_US\n"
 "Language-Team: en_US <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n != 1)\n"
 "MIME-Version: 1.0\n"
@@ -934,6 +941,7 @@ def test_init_singular_plural_forms(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: ja_JP\n"
 "Language-Team: ja_JP <LL@li.org>\n"
 "Plural-Forms: nplurals=1; plural=0\n"
 "MIME-Version: 1.0\n"
@@ -980,6 +988,7 @@ def test_init_more_than_2_plural_forms(self):
 "POT-Creation-Date: 2007-04-01 15:30+0200\n"
 "PO-Revision-Date: %(date)s\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: lv_LV\n"
 "Language-Team: lv_LV <LL@li.org>\n"
 "Plural-Forms: nplurals=3; plural=(n%%10==1 && n%%100!=11 ? 0 : n != 0 ? 1 :"
 " 2)\n"