diff --git a/Lib/ast.py b/Lib/ast.py
index e347d8b9da..9d1299cd36 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -28,6 +28,7 @@ import sys
 from _ast import *
 from contextlib import contextmanager, nullcontext
 from enum import IntEnum, auto
+from functools import lru_cache
 
 
 def parse(source, filename='<unknown>', mode='exec', *,
@@ -101,8 +102,32 @@ def literal_eval(node_or_string):
         return _convert_signed_num(node)
     return _convert(node_or_string)
 
-
-def dump(node, annotate_fields=True, include_attributes=False, *, indent=None):
+@lru_cache
+def _field_defaults(node):
+    fields = {}
+    signature = node.__doc__
+    if not node._fields:
+        return fields
+    for field in signature[len(node.__name__)+1:-1].split(", "):
+        field_type, field_name = field.split()
+        if field_type[-1] == "?":
+            default_value = None
+        elif field_type[-1] == "*":
+            default_value = []
+        else:
+            continue
+
+        fields[field_name] = default_value
+    return fields
+
+def dump(
+    node,
+    annotate_fields=True,
+    include_attributes=False,
+    *,
+    indent=None,
+    omit_defaults=False
+):
     """
     Return a formatted dump of the tree in node.  This is mainly useful for
     debugging purposes.  If annotate_fields is true (by default),
@@ -112,7 +137,9 @@ def dump(node, annotate_fields=True, include_attributes=False, *, indent=None):
     numbers and column offsets are not dumped by default.  If this is wanted,
     include_attributes can be set to true.  If indent is a non-negative
     integer or string, then the tree will be pretty-printed with that indent
-    level. None (the default) selects the single line representation.
+    level. None (the default) selects the single line representation. If
+    omit_defaults is True, default values of nodes will be omitted from the
+    representation.
     """
     def _format(node, level=0):
         if indent is not None:
@@ -127,13 +154,18 @@ def dump(node, annotate_fields=True, include_attributes=False, *, indent=None):
             args = []
             allsimple = True
             keywords = annotate_fields
+            field_defaults = _field_defaults(cls)
             for name in node._fields:
                 try:
                     value = getattr(node, name)
                 except AttributeError:
                     keywords = True
                     continue
-                if value is None and getattr(cls, name, ...) is None:
+                if (
+                    omit_defaults
+                    and name in field_defaults
+                    and value == field_defaults[name]
+                ):
                     keywords = True
                     continue
                 value, simple = _format(value, level)
@@ -148,7 +180,11 @@ def dump(node, annotate_fields=True, include_attributes=False, *, indent=None):
                         value = getattr(node, name)
                     except AttributeError:
                         continue
-                    if value is None and getattr(cls, name, ...) is None:
+                    if (
+                        omit_defaults
+                        and value is None
+                        and getattr(cls, name, ...) is None
+                    ):
                         continue
                     value, simple = _format(value, level)
                     allsimple = allsimple and simple