diff --git a/CHANGES b/CHANGES
index 8ee3fd092..60ec69e07 100644
--- a/CHANGES
+++ b/CHANGES
@@ -24,6 +24,7 @@ Features added
   :confval:`suppress_warnings`
 * C, added scope control directives, :rst:dir:`c:namespace`,
   :rst:dir:`c:namespace-push`, and :rst:dir:`c:namespace-pop`.
+* #2044: autodoc: Suppress default value for instance attributes
 * #7466: autosummary: headings in generated documents are not translated
 * #7490: autosummary: Add ``:caption:`` option to autosummary directive to set a
   caption to the toctree
diff --git a/sphinx/ext/autodoc/__init__.py b/sphinx/ext/autodoc/__init__.py
index 4a8bd0e27..1d0ecd09e 100644
--- a/sphinx/ext/autodoc/__init__.py
+++ b/sphinx/ext/autodoc/__init__.py
@@ -1600,8 +1600,11 @@ class AttributeDocumenter(DocstringStripSignatureMixin, ClassLevelDocumenter):
                                       sourcename)
 
                 try:
-                    objrepr = object_description(self.object)
-                    self.add_line('   :value: ' + objrepr, sourcename)
+                    if self.object is INSTANCEATTR:
+                        pass
+                    else:
+                        objrepr = object_description(self.object)
+                        self.add_line('   :value: ' + objrepr, sourcename)
                 except ValueError:
                     pass
         elif self.options.annotation is SUPPRESS:
@@ -1672,6 +1675,7 @@ class InstanceAttributeDocumenter(AttributeDocumenter):
         """Never import anything."""
         # disguise as an attribute
         self.objtype = 'attribute'
+        self.object = INSTANCEATTR
         self._datadescriptor = False
         return True
 
diff --git a/tests/test_autodoc.py b/tests/test_autodoc.py
index dd474536d..6a65082aa 100644
--- a/tests/test_autodoc.py
+++ b/tests/test_autodoc.py
@@ -1032,14 +1032,12 @@ def test_instance_attributes(app):
         '',
         '   .. py:attribute:: InstAttCls.ia1',
         '      :module: target',
-        '      :value: None',
         '',
         '      Doc comment for instance attribute InstAttCls.ia1',
         '',
         '',
         '   .. py:attribute:: InstAttCls.ia2',
         '      :module: target',
-        '      :value: None',
         '',
         '      Docstring for instance attribute InstAttCls.ia2.',
         ''
@@ -1066,7 +1064,6 @@ def test_instance_attributes(app):
         '',
         '   .. py:attribute:: InstAttCls.ia1',
         '      :module: target',
-        '      :value: None',
         '',
         '      Doc comment for instance attribute InstAttCls.ia1',
         ''
@@ -1485,7 +1482,6 @@ def test_autodoc_typed_instance_variables(app):
         '   .. py:attribute:: Class.attr2',
         '      :module: target.typed_vars',
         '      :type: int',
-        '      :value: None',
         '',
         '',
         '   .. py:attribute:: Class.attr3',
@@ -1497,7 +1493,6 @@ def test_autodoc_typed_instance_variables(app):
         '   .. py:attribute:: Class.attr4',
         '      :module: target.typed_vars',
         '      :type: int',
-        '      :value: None',
         '',
         '      attr4',
         '',
@@ -1505,7 +1500,6 @@ def test_autodoc_typed_instance_variables(app):
         '   .. py:attribute:: Class.attr5',
         '      :module: target.typed_vars',
         '      :type: int',
-        '      :value: None',
         '',
         '      attr5',
         '',
@@ -1513,7 +1507,6 @@ def test_autodoc_typed_instance_variables(app):
         '   .. py:attribute:: Class.attr6',
         '      :module: target.typed_vars',
         '      :type: int',
-        '      :value: None',
         '',
         '      attr6',
         '',