diff --git a/django/contrib/humanize/templatetags/humanize.py b/django/contrib/humanize/templatetags/humanize.py
index 19000c185c..174e367a69 100644
--- a/django/contrib/humanize/templatetags/humanize.py
+++ b/django/contrib/humanize/templatetags/humanize.py
@@ -24,12 +24,14 @@ register = template.Library()
 def ordinal(value):
     """
     Convert an integer to its ordinal as a string. 1 is '1st', 2 is '2nd',
-    3 is '3rd', etc. Works for any integer.
+    3 is '3rd', etc. Works for any non-negative integer.
     """
     try:
         value = int(value)
     except (TypeError, ValueError):
         return value
+    if value < 0:
+        return str(value)
     if value % 100 in (11, 12, 13):
         # Translators: Ordinal format for 11 (11th), 12 (12th), and 13 (13th).
         value = pgettext("ordinal 11, 12, 13", "{}th").format(value)
diff --git a/docs/ref/contrib/humanize.txt b/docs/ref/contrib/humanize.txt
index 7c1af53ed3..1596f30b97 100644
--- a/docs/ref/contrib/humanize.txt
+++ b/docs/ref/contrib/humanize.txt
@@ -143,3 +143,4 @@ Examples:
 * ``3`` becomes ``3rd``.
 
 You can pass in either an integer or a string representation of an integer.
+Negative integers are returned unchanged.
diff --git a/tests/humanize_tests/tests.py b/tests/humanize_tests/tests.py
index 5e4f7f0ef7..ab967e2874 100644
--- a/tests/humanize_tests/tests.py
+++ b/tests/humanize_tests/tests.py
@@ -55,6 +55,9 @@ class HumanizeTests(SimpleTestCase):
             "102",
             "103",
             "111",
+            "-0",
+            "-1",
+            "-105",
             "something else",
             None,
         )
@@ -70,6 +73,9 @@ class HumanizeTests(SimpleTestCase):
             "102nd",
             "103rd",
             "111th",
+            "0th",
+            "-1",
+            "-105",
             "something else",
             None,
         )