diff --git a/src/humanize/number.py b/src/humanize/number.py
index 52a5356a..33c97529 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -136,7 +136,10 @@ def ordinal(value: NumberOrString, gender: str = "male") -> str:
     except (TypeError, ValueError):
         return str(value)
     gender = "male" if gender == "male" else "female"
-    digit = 0 if value % 100 in (11, 12, 13) else value % 10
+    # Use the magnitude so negatives pick the right suffix: Python's modulo of a
+    # negative number would otherwise map e.g. -9 to "st" and -1 to "th".
+    magnitude = abs(value)
+    digit = 0 if magnitude % 100 in (11, 12, 13) else magnitude % 10
     return f"{value}{P_(*_ORDINAL_SUFFIXES[gender][digit])}"
 
 
diff --git a/tests/test_number.py b/tests/test_number.py
index 5fb12fa6..c24b5ef5 100644
--- a/tests/test_number.py
+++ b/tests/test_number.py
@@ -25,6 +25,16 @@
         ("102", "102nd"),
         ("103", "103rd"),
         ("111", "111th"),
+        ("-1", "-1st"),
+        ("-2", "-2nd"),
+        ("-3", "-3rd"),
+        ("-4", "-4th"),
+        ("-9", "-9th"),
+        ("-11", "-11th"),
+        ("-21", "-21st"),
+        ("-22", "-22nd"),
+        ("-23", "-23rd"),
+        ("-111", "-111th"),
         ("something else", "something else"),
         (None, "None"),
         (math.nan, "NaN"),