diff --git a/django/db/models/expressions.py b/django/db/models/expressions.py
index adafd26e89..2db832e1eb 100644
--- a/django/db/models/expressions.py
+++ b/django/db/models/expressions.py
@@ -939,7 +939,7 @@ class Subquery(Expression):
                 )
                 # Add table alias to the parent query's aliases to prevent
                 # quoting.
-                if hasattr(resolved, 'alias'):
+                if hasattr(resolved, 'alias') and resolved.alias != resolved.target.model._meta.db_table:
                     clone.queryset.query.external_aliases.add(resolved.alias)
                 return resolved
             return child
diff --git a/docs/releases/1.11.7.txt b/docs/releases/1.11.7.txt
index fe2cf2e300..81334533e9 100644
--- a/docs/releases/1.11.7.txt
+++ b/docs/releases/1.11.7.txt
@@ -16,3 +16,6 @@ Bugfixes
 
 * Made ``QuerySet.reverse()`` affect ``nulls_first`` and ``nulls_last``
   (:ticket:`28722`).
+
+* Fixed unquoted table names in ``Subquery`` SQL when using ``OuterRef``
+  (:ticket:`28689`).
diff --git a/tests/expressions/models.py b/tests/expressions/models.py
index b1a737d0b9..678af731f8 100644
--- a/tests/expressions/models.py
+++ b/tests/expressions/models.py
@@ -56,6 +56,7 @@ class Experiment(models.Model):
     end = models.DateTimeField()
 
     class Meta:
+        db_table = 'expressions_ExPeRiMeNt'
         ordering = ('name',)
 
     def duration(self):
diff --git a/tests/expressions/tests.py b/tests/expressions/tests.py
index 253a9c0429..17d4ec4e7b 100644
--- a/tests/expressions/tests.py
+++ b/tests/expressions/tests.py
@@ -533,6 +533,11 @@ class BasicExpressionsTests(TestCase):
         outer = Company.objects.filter(pk__in=Subquery(inner.values('pk')))
         self.assertFalse(outer.exists())
 
+    def test_outerref_mixed_case_table_name(self):
+        inner = Result.objects.filter(result_time__gte=OuterRef('experiment__assigned'))
+        outer = Result.objects.filter(pk__in=Subquery(inner.values('pk')))
+        self.assertFalse(outer.exists())
+
 
 class IterableLookupInnerExpressionsTests(TestCase):
     @classmethod