diff --git a/django/utils/numberformat.py b/django/utils/numberformat.py
index 6a31237f135..c3cf55bca5f 100644
--- a/django/utils/numberformat.py
+++ b/django/utils/numberformat.py
@@ -1,3 +1,5 @@
+from decimal import Decimal
+
 from django.conf import settings
 from django.utils.safestring import mark_safe
 from django.utils import six
@@ -22,7 +24,10 @@ def format(number, decimal_sep, decimal_pos=None, grouping=0, thousand_sep='',
         return mark_safe(six.text_type(number))
     # sign
     sign = ''
-    str_number = six.text_type(number)
+    if isinstance(number, Decimal):
+        str_number = '{:f}'.format(number)
+    else:
+        str_number = six.text_type(number)
     if str_number[0] == '-':
         sign = '-'
         str_number = str_number[1:]
diff --git a/tests/utils_tests/test_numberformat.py b/tests/utils_tests/test_numberformat.py
index f9d9031e488..80f222d9555 100644
--- a/tests/utils_tests/test_numberformat.py
+++ b/tests/utils_tests/test_numberformat.py
@@ -1,6 +1,8 @@
-from unittest import TestCase
-from django.utils.numberformat import format as nformat
+from decimal import Decimal
 from sys import float_info
+from unittest import TestCase
+
+from django.utils.numberformat import format as nformat
 
 
 class TestNumberFormat(TestCase):
@@ -45,3 +47,12 @@ class TestNumberFormat(TestCase):
         self.assertEqual(nformat(0 - int_max, '.'), most_max.format('-', '8'))
         self.assertEqual(nformat(-1 - int_max, '.'), most_max.format('-', '9'))
         self.assertEqual(nformat(-2 * int_max, '.'), most_max2.format('-'))
+
+    def test_decimal_numbers(self):
+        self.assertEqual(nformat(Decimal('1234'), '.'), '1234')
+        self.assertEqual(nformat(Decimal('1234.2'), '.'), '1234.2')
+        self.assertEqual(nformat(Decimal('1234'), '.', decimal_pos=2), '1234.00')
+        self.assertEqual(nformat(Decimal('1234'), '.', grouping=2, thousand_sep=','), '1234')
+        self.assertEqual(nformat(Decimal('1234'), '.', grouping=2, thousand_sep=',', force_grouping=True), '12,34')
+        self.assertEqual(nformat(Decimal('-1234.33'), '.', decimal_pos=1), '-1234.3')
+        self.assertEqual(nformat(Decimal('0.00000001'), '.', decimal_pos=8), '0.00000001')