diff --git a/django/conf/global_settings.py b/django/conf/global_settings.py
index 3690898bed..0ab3fb9fb9 100644
--- a/django/conf/global_settings.py
+++ b/django/conf/global_settings.py
@@ -132,6 +132,7 @@ LANGUAGES = [
     ('sw', gettext_noop('Swahili')),
     ('ta', gettext_noop('Tamil')),
     ('te', gettext_noop('Telugu')),
+    ('tg', gettext_noop('Tajik')),
     ('th', gettext_noop('Thai')),
     ('tr', gettext_noop('Turkish')),
     ('tt', gettext_noop('Tatar')),
diff --git a/django/conf/locale/__init__.py b/django/conf/locale/__init__.py
index 03128f617f..a67f48f2d3 100644
--- a/django/conf/locale/__init__.py
+++ b/django/conf/locale/__init__.py
@@ -512,6 +512,12 @@ LANG_INFO = {
         'name': 'Telugu',
         'name_local': 'తెలుగు',
     },
+    'tg': {
+        'bidi': False,
+        'code': 'tg',
+        'name': 'Tajik',
+        'name_local': 'тоҷикӣ',
+    },
     'th': {
         'bidi': False,
         'code': 'th',
diff --git a/django/conf/locale/en/LC_MESSAGES/django.po b/django/conf/locale/en/LC_MESSAGES/django.po
index ea139212fb..cebe11b41b 100644
--- a/django/conf/locale/en/LC_MESSAGES/django.po
+++ b/django/conf/locale/en/LC_MESSAGES/django.po
@@ -346,6 +346,10 @@ msgstr ""
 msgid "Telugu"
 msgstr ""
 
+#: conf/global_settings.py:133
+msgid "Tajik"
+msgstr ""
+
 #: conf/global_settings.py:134
 msgid "Thai"
 msgstr ""
diff --git a/django/conf/locale/tg/__init__.py b/django/conf/locale/tg/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/django/conf/locale/tg/formats.py b/django/conf/locale/tg/formats.py
new file mode 100644
index 0000000000..3e7651d755
--- /dev/null
+++ b/django/conf/locale/tg/formats.py
@@ -0,0 +1,32 @@
+# This file is distributed under the same license as the Django package.
+#
+# The *_FORMAT strings use the Django date format syntax,
+# see https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
+DATE_FORMAT = 'j E Y г.'
+TIME_FORMAT = 'G:i'
+DATETIME_FORMAT = 'j E Y г. G:i'
+YEAR_MONTH_FORMAT = 'F Y г.'
+MONTH_DAY_FORMAT = 'j F'
+SHORT_DATE_FORMAT = 'd.m.Y'
+SHORT_DATETIME_FORMAT = 'd.m.Y H:i'
+FIRST_DAY_OF_WEEK = 1  # Monday
+
+# The *_INPUT_FORMATS strings use the Python strftime format syntax,
+# see https://docs.python.org/library/datetime.html#strftime-strptime-behavior
+DATE_INPUT_FORMATS = [
+    '%d.%m.%Y',  # '25.10.2006'
+    '%d.%m.%y',  # '25.10.06'
+]
+DATETIME_INPUT_FORMATS = [
+    '%d.%m.%Y %H:%M:%S',     # '25.10.2006 14:30:59'
+    '%d.%m.%Y %H:%M:%S.%f',  # '25.10.2006 14:30:59.000200'
+    '%d.%m.%Y %H:%M',        # '25.10.2006 14:30'
+    '%d.%m.%Y',              # '25.10.2006'
+    '%d.%m.%y %H:%M:%S',     # '25.10.06 14:30:59'
+    '%d.%m.%y %H:%M:%S.%f',  # '25.10.06 14:30:59.000200'
+    '%d.%m.%y %H:%M',        # '25.10.06 14:30'
+    '%d.%m.%y',              # '25.10.06'
+]
+DECIMAL_SEPARATOR = ','
+THOUSAND_SEPARATOR = '\xa0'  # non-breaking space
+NUMBER_GROUPING = 3
diff --git a/docs/releases/3.1.txt b/docs/releases/3.1.txt
index ba96ea670f..af7ec6fe5a 100644
--- a/docs/releases/3.1.txt
+++ b/docs/releases/3.1.txt
@@ -296,7 +296,8 @@ Internationalization
   (string) value to explicitly state that the cookie is sent with all same-site
   and cross-site requests.
 
-* Added support and translations for the Algerian Arabic and Kyrgyz languages.
+* Added support and translations for the Algerian Arabic, Kyrgyz, and Tajik
+  languages.
 
 Management Commands
 ~~~~~~~~~~~~~~~~~~~
diff --git a/docs/spelling_wordlist b/docs/spelling_wordlist
index 5a6b53eeef..1a6d35ec5a 100644
--- a/docs/spelling_wordlist
+++ b/docs/spelling_wordlist
@@ -661,6 +661,7 @@ systemwide
 tablespace
 tablespaces
 tagline
+Tajik
 tarball
 tarballs
 teardown