diff --git a/metadata/fields/custom/version.py b/metadata/fields/custom/version.py
new file mode 100644
index 000000000..2b51901a7
--- /dev/null
+++ b/metadata/fields/custom/version.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+# Copyright 2023 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import re
+import sys
+from typing import Union
+
+_THIS_DIR = os.path.abspath(os.path.dirname(__file__))
+# The repo's root directory.
+_ROOT_DIR = os.path.abspath(os.path.join(_THIS_DIR, "..", "..", ".."))
+
+# Add the repo's root directory for clearer imports.
+sys.path.insert(0, _ROOT_DIR)
+
+import metadata.fields.types as field_types
+import metadata.fields.util as util
+import metadata.validation_result as vr
+
+_PATTERN_NOT_APPLICABLE = re.compile(r"^N ?\/ ?A$", re.IGNORECASE)
+
+
+def is_version_unknown(value: str) -> bool:
+  """Returns whether the value denotes the version being unknown."""
+  return (value == "0" or util.matches(_PATTERN_NOT_APPLICABLE, value)
+          or util.is_unknown(value))
+
+
+class VersionField(field_types.MetadataField):
+  """Custom field for the package version."""
+  def __init__(self):
+    super().__init__(name="Version", one_liner=True)
+
+  def validate(self, value: str) -> Union[vr.ValidationResult, None]:
+    """Checks the given value is acceptable - there must be at least one
+    non-whitespace character, and "N/A" is preferred over "0" if the version is
+    unknown.
+    """
+    if value == "0" or util.is_unknown(value):
+      return vr.ValidationWarning(
+          f"{self._name} is '{value}' - use 'N/A' if this package does not "
+          "version or is versioned by date or revision.")
+
+    if util.is_empty(value):
+      return vr.ValidationError(
+          f"{self._name} is empty - use 'N/A' if this package is versioned by "
+          "date or revision.")
+
+    return None
diff --git a/metadata/fields/known.py b/metadata/fields/known.py
index abddf2b75..2ab88036f 100644
--- a/metadata/fields/known.py
+++ b/metadata/fields/known.py
@@ -16,6 +16,7 @@ sys.path.insert(0, _ROOT_DIR)
 
 import metadata.fields.custom.cpe_prefix
 import metadata.fields.custom.date
+import metadata.fields.custom.version
 import metadata.fields.types as field_types
 
 # Freeform text fields.
@@ -35,10 +36,12 @@ LICENSE_ANDROID_COMPATIBLE = field_types.YesNoField(
 # Custom fields.
 CPE_PREFIX = metadata.fields.custom.cpe_prefix.CPEPrefixField()
 DATE = metadata.fields.custom.date.DateField()
+VERSION = metadata.fields.custom.version.VersionField()
 
 ALL_FIELDS = (
     NAME,
     SHORT_NAME,
+    VERSION,
     DATE,
     REVISION,
     SECURITY_CRITICAL,
diff --git a/metadata/tests/fields_test.py b/metadata/tests/fields_test.py
index ddd99d1cb..343dc1141 100644
--- a/metadata/tests/fields_test.py
+++ b/metadata/tests/fields_test.py
@@ -82,6 +82,14 @@ class FieldValidationTest(unittest.TestCase):
         error_values=["", "\n", "April 3, 2012", "2012/03/04"],
     )
 
+  def test_version_validation(self):
+    self._run_field_validation(
+        field=known_fields.VERSION,
+        valid_values=["n / a", "123abc", "unknown forked version"],
+        error_values=["", "\n"],
+        warning_values=["0", "unknown"],
+    )
+
 
 if __name__ == "__main__":
   unittest.main()