diff --git a/django/contrib/humanize/templatetags/humanize.py b/django/contrib/humanize/templatetags/humanize.py
index 31880846f0..18a53adbe4 100644
--- a/django/contrib/humanize/templatetags/humanize.py
+++ b/django/contrib/humanize/templatetags/humanize.py
@@ -140,7 +140,8 @@ def intword(value):
     except (TypeError, ValueError):
         return value
 
-    if value < 1000000:
+    abs_value = abs(value)
+    if abs_value < 1000000:
         return value
 
     def _check_for_i18n(value, float_formatted, string_formatted):
@@ -156,10 +157,10 @@ def intword(value):
 
     for exponent, converters in intword_converters:
         large_number = 10 ** exponent
-        if value < large_number * 1000:
+        if abs_value < large_number * 1000:
             new_value = value / large_number
             rounded_value = round_away_from_one(new_value)
-            return _check_for_i18n(new_value, *converters(rounded_value))
+            return _check_for_i18n(new_value, *converters(abs(rounded_value)))
     return value
 
 
diff --git a/docs/ref/contrib/humanize.txt b/docs/ref/contrib/humanize.txt
index edbdb136b0..8914ef8de7 100644
--- a/docs/ref/contrib/humanize.txt
+++ b/docs/ref/contrib/humanize.txt
@@ -66,6 +66,7 @@ Examples:
 * ``1000000`` becomes ``1.0 million``.
 * ``1200000`` becomes ``1.2 million``.
 * ``1200000000`` becomes ``1.2 billion``.
+* ``-1200000000`` becomes ``-1.2 billion``.
 
 Values up to 10^100 (Googol) are supported.
 
@@ -75,12 +76,17 @@ e.g. with the ``'de'`` language:
 * ``1000000`` becomes ``'1,0 Million'``.
 * ``1200000`` becomes ``'1,2 Millionen'``.
 * ``1200000000`` becomes ``'1,2 Milliarden'``.
+* ``-1200000000`` becomes ``'-1,2 Milliarden'``.
 
 .. versionchanged:: 3.0
 
     All numeric values are now translated as plural, except ``1.0`` which is
     translated as a singular phrase. This may be incorrect for some languages.
 
+.. versionchanged:: 3.1
+
+    Support for negative integers was added.
+
 .. templatefilter:: naturalday
 
 ``naturalday``
diff --git a/docs/releases/3.1.txt b/docs/releases/3.1.txt
index bbde94a34e..278752db90 100644
--- a/docs/releases/3.1.txt
+++ b/docs/releases/3.1.txt
@@ -77,6 +77,11 @@ Minor features
 * Added the :class:`~django.contrib.gis.db.models.functions.AsWKB` and
   :class:`~django.contrib.gis.db.models.functions.AsWKT` functions.
 
+:mod:`django.contrib.humanize`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* :tfilter:`intword` template filter now supports negative integers.
+
 :mod:`django.contrib.messages`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/tests/humanize_tests/tests.py b/tests/humanize_tests/tests.py
index 7396c417ab..a0d16bbfed 100644
--- a/tests/humanize_tests/tests.py
+++ b/tests/humanize_tests/tests.py
@@ -99,19 +99,27 @@ class HumanizeTests(SimpleTestCase):
             self.humanize_tester([100], ['100'], 'intcomma')
 
     def test_intword(self):
-        test_list = (
+        # Positive integers.
+        test_list_positive = (
             '100', '1000000', '1200000', '1290000', '1000000000', '2000000000',
             '6000000000000', '1300000000000000', '3500000000000000000000',
-            '8100000000000000000000000000000000', None, ('1' + '0' * 100),
+            '8100000000000000000000000000000000', ('1' + '0' * 100),
             ('1' + '0' * 104),
         )
-        result_list = (
+        result_list_positive = (
             '100', '1.0 million', '1.2 million', '1.3 million', '1.0 billion',
             '2.0 billion', '6.0 trillion', '1.3 quadrillion', '3.5 sextillion',
-            '8.1 decillion', None, '1.0 googol', ('1' + '0' * 104),
+            '8.1 decillion', '1.0 googol', ('1' + '0' * 104),
         )
+        # Negative integers.
+        test_list_negative = ('-' + test for test in test_list_positive)
+        result_list_negative = ('-' + result for result in result_list_positive)
         with translation.override('en'):
-            self.humanize_tester(test_list, result_list, 'intword')
+            self.humanize_tester(
+                (*test_list_positive, *test_list_negative, None),
+                (*result_list_positive, *result_list_negative, None),
+                'intword',
+            )
 
     def test_i18n_intcomma(self):
         test_list = (100, 1000, 10123, 10311, 1000000, 1234567.25,
@@ -123,17 +131,25 @@ class HumanizeTests(SimpleTestCase):
                 self.humanize_tester(test_list, result_list, 'intcomma')
 
     def test_i18n_intword(self):
-        test_list = (
+        # Positive integers.
+        test_list_positive = (
             '100', '1000000', '1200000', '1290000', '1000000000', '2000000000',
             '6000000000000',
         )
-        result_list = (
+        result_list_positive = (
             '100', '1,0 Million', '1,2 Millionen', '1,3 Millionen',
             '1,0 Milliarde', '2,0 Milliarden', '6,0 Billionen',
         )
+        # Negative integers.
+        test_list_negative = ('-' + test for test in test_list_positive)
+        result_list_negative = ('-' + result for result in result_list_positive)
         with self.settings(USE_L10N=True, USE_THOUSAND_SEPARATOR=True):
             with translation.override('de'):
-                self.humanize_tester(test_list, result_list, 'intword')
+                self.humanize_tester(
+                    (*test_list_positive, *test_list_negative),
+                    (*result_list_positive, *result_list_negative),
+                    'intword',
+                )
 
     def test_apnumber(self):
         test_list = [str(x) for x in range(1, 11)]