diff --git a/django/utils/formats.py b/django/utils/formats.py
index 3cb0c0420ca..aaf1c2ddd50 100644
--- a/django/utils/formats.py
+++ b/django/utils/formats.py
@@ -240,7 +240,7 @@ def sanitize_separators(value):
     Sanitize a value according to the current decimal and
     thousand separator setting. Used with form field input.
     """
-    if settings.USE_L10N and isinstance(value, str):
+    if isinstance(value, str):
         parts = []
         decimal_separator = get_format('DECIMAL_SEPARATOR')
         if decimal_separator in value:
diff --git a/docs/releases/2.0.txt b/docs/releases/2.0.txt
index f21d53cd8aa..4babd84773a 100644
--- a/docs/releases/2.0.txt
+++ b/docs/releases/2.0.txt
@@ -157,6 +157,10 @@ Forms
   HTML attributes for the ``DateInput`` and ``TimeInput`` (or hidden)
   subwidgets.
 
+* :class:`~django.forms.FloatField` and :class:`~django.forms.DecimalField`
+  now handle :setting:`DECIMAL_SEPARATOR` and :setting:`THOUSAND_SEPARATOR`
+  correctly when :setting:`USE_L10N` is off.
+
 Generic Views
 ~~~~~~~~~~~~~
 
diff --git a/tests/forms_tests/field_tests/test_decimalfield.py b/tests/forms_tests/field_tests/test_decimalfield.py
index c8fd95fd684..1d5d27c8a0d 100644
--- a/tests/forms_tests/field_tests/test_decimalfield.py
+++ b/tests/forms_tests/field_tests/test_decimalfield.py
@@ -1,7 +1,7 @@
 import decimal
 
 from django.forms import DecimalField, NumberInput, ValidationError, Widget
-from django.test import SimpleTestCase
+from django.test import SimpleTestCase, override_settings
 from django.utils import formats, translation
 
 from . import FormFieldAssertionsMixin
@@ -156,3 +156,18 @@ class DecimalFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
             f = DecimalField(max_digits=2, decimal_places=2, localize=True)
             localized_d = formats.localize_input(d)  # -> '0,1' in French
             self.assertFalse(f.has_changed(d, localized_d))
+
+    @override_settings(USE_L10N=False, DECIMAL_SEPARATOR=',')
+    def test_decimalfield_support_decimal_separator(self):
+        f = DecimalField(localize=True)
+        self.assertEqual(f.clean('1001,10'), decimal.Decimal("1001.10"))
+        self.assertEqual(f.clean('1001.10'), decimal.Decimal("1001.10"))
+
+    @override_settings(USE_L10N=False, DECIMAL_SEPARATOR=',', USE_THOUSAND_SEPARATOR=True,
+                       THOUSAND_SEPARATOR='.')
+    def test_decimalfield_support_thousands_separator(self):
+        f = DecimalField(localize=True)
+        self.assertEqual(f.clean('1.001,10'), decimal.Decimal("1001.10"))
+        msg = "'Enter a number.'"
+        with self.assertRaisesMessage(ValidationError, msg):
+            f.clean('1,001.1')
diff --git a/tests/forms_tests/field_tests/test_floatfield.py b/tests/forms_tests/field_tests/test_floatfield.py
index 83209d7c668..b36942afa43 100644
--- a/tests/forms_tests/field_tests/test_floatfield.py
+++ b/tests/forms_tests/field_tests/test_floatfield.py
@@ -1,5 +1,6 @@
 from django.forms import FloatField, NumberInput, ValidationError
 from django.test import SimpleTestCase
+from django.test.utils import override_settings
 from django.utils import formats, translation
 
 from . import FormFieldAssertionsMixin
@@ -83,3 +84,18 @@ class FloatFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
             f = FloatField(localize=True)
             localized_n = formats.localize_input(n)  # -> '4,35' in French
             self.assertFalse(f.has_changed(n, localized_n))
+
+    @override_settings(USE_L10N=False, DECIMAL_SEPARATOR=',')
+    def test_decimalfield_support_decimal_separator(self):
+        f = FloatField(localize=True)
+        self.assertEqual(f.clean('1001,10'), 1001.10)
+        self.assertEqual(f.clean('1001.10'), 1001.10)
+
+    @override_settings(USE_L10N=False, DECIMAL_SEPARATOR=',', USE_THOUSAND_SEPARATOR=True,
+                       THOUSAND_SEPARATOR='.')
+    def test_decimalfield_support_thousands_separator(self):
+        f = FloatField(localize=True)
+        self.assertEqual(f.clean('1.001,10'), 1001.10)
+        msg = "'Enter a number.'"
+        with self.assertRaisesMessage(ValidationError, msg):
+            f.clean('1,001.1')