diff --git a/marshmallow/schema.py b/marshmallow/schema.py
index 2327081a..79bb8ee1 100644
--- a/marshmallow/schema.py
+++ b/marshmallow/schema.py
@@ -836,11 +836,11 @@ class BaseSchema(base.SchemaABC):
             if pass_many:
                 validator = functools.partial(validator, many=many)
             if many and not pass_many:
-                for idx, item in enumerate(data):
+                for idx, (item, orig) in enumerate(zip(data, original_data)):
                     try:
-                        self._unmarshal.run_validator(validator,
-                                                  item, original_data, self.fields, many=many,
-                                                  index=idx, pass_original=pass_original)
+                        self._unmarshal.run_validator(
+                            validator, item, orig, self.fields, many=many,
+                            index=idx, pass_original=pass_original)
                     except ValidationError as err:
                         errors.update(err.messages)
             else:

post_dump is passing a list of objects as original object
Hi,

I think post_dump with pass_original=True should pass the original object related to the data serialized and not a list of objects which this object belongs to.

``` python
from marshmallow import fields, post_dump, Schema

class DeviceSchema(Schema):
    id = fields.String()

    @post_dump(pass_original=True)
    def __post_dump(self, data, obj):
        print(obj)  # <-- this is a list

devices = [dict(id=1), dict(id=2)]
DeviceSchema().dump(devices, many=True)
```

In the above example, the parameter `obj` is a list of devices rather than the device object itself.

What do you think?

diff --git a/tests/test_decorators.py b/tests/test_decorators.py
index 3fb3f1bb..226e550f 100644
--- a/tests/test_decorators.py
+++ b/tests/test_decorators.py
@@ -365,6 +365,35 @@ class TestValidatesSchemaDecorator:
         assert '_schema' in errors['nested']
         assert 'foo' not in errors['nested']
 
+    @pytest.mark.parametrize("data", ([{"foo": 1, "bar": 2}],))
+    @pytest.mark.parametrize(
+        "pass_many,expected_data,expected_original_data",
+        (
+            [True, [{"foo": 1}], [{"foo": 1, "bar": 2}]],
+            [False, {"foo": 1}, {"foo": 1, "bar": 2}],
+        ),
+    )
+    def test_validator_nested_many_pass_original_and_pass_many(
+            self, pass_many, data, expected_data, expected_original_data):
+
+        class NestedSchema(Schema):
+            foo = fields.Int(required=True)
+
+            @validates_schema(pass_many=pass_many, pass_original=True)
+            def validate_schema(self, data, original_data, many=False):
+                assert data == expected_data
+                assert original_data == expected_original_data
+                assert many is pass_many
+                raise ValidationError("Method called")
+
+        class MySchema(Schema):
+            nested = fields.Nested(NestedSchema, required=True, many=True)
+
+        schema = MySchema()
+        errors = schema.validate({"nested": data})
+        error = errors["nested"] if pass_many else errors["nested"][0]
+        assert error["_schema"][0] == "Method called"
+
     def test_decorated_validators(self):
 
         class MySchema(Schema):

pip install -e .[reco]
parse_log_pytest
requirements.txt
pytest pytest-cov pytest-xdist pytest-mock pytest-asyncio pytest
3.9
dev-requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
attrs==25.3.0
coverage==7.8.0
distlib==0.3.9
exceptiongroup==1.2.2
execnet==2.1.1
filelock==3.18.0
flake8==3.5.0
iniconfig==2.1.0
invoke==0.22.0
-e git+https://github.com/marshmallow-code/marshmallow.git@642d18b58d9b42d16b450a30b42aa57ea3859192#egg=marshmallow
mccabe==0.6.1
packaging==24.2
platformdirs==4.3.7
pluggy==1.5.0
py==1.11.0
pycodestyle==2.3.1
pyflakes==1.6.0
pytest==8.3.5
pytest-asyncio==0.26.0
pytest-cov==6.0.0
pytest-mock==3.14.0
pytest-xdist==3.6.1
python-dateutil==2.6.1
pytz==2017.3
simplejson==3.13.2
six==1.17.0
toml==0.10.2
tomli==2.2.1
tox==3.12.1
typing_extensions==4.13.0
virtualenv==20.29.3

name: marshmallow
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.4.4=h6a678d5_1
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=3.0.16=h5eee18b_0
  - pip=25.0=py39h06a4308_0
  - python=3.9.21=he870216_1
  - readline=8.2=h5eee18b_0
  - setuptools=75.8.0=py39h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - tzdata=2025a=h04d1e81_0
  - wheel=0.45.1=py39h06a4308_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - attrs==25.3.0
      - coverage==7.8.0
      - distlib==0.3.9
      - exceptiongroup==1.2.2
      - execnet==2.1.1
      - filelock==3.18.0
      - flake8==3.5.0
      - iniconfig==2.1.0
      - invoke==0.22.0
      - mccabe==0.6.1
      - packaging==24.2
      - platformdirs==4.3.7
      - pluggy==1.5.0
      - py==1.11.0
      - pycodestyle==2.3.1
      - pyflakes==1.6.0
      - pytest==8.3.5
      - pytest-asyncio==0.26.0
      - pytest-cov==6.0.0
      - pytest-mock==3.14.0
      - pytest-xdist==3.6.1
      - python-dateutil==2.6.1
      - pytz==2017.3
      - simplejson==3.13.2
      - six==1.17.0
      - toml==0.10.2
      - tomli==2.2.1
      - tox==3.12.1
      - typing-extensions==4.13.0
      - virtualenv==20.29.3
prefix: /opt/conda/envs/marshmallow

tests/test_decorators.py::TestValidatesSchemaDecorator::test_validator_nested_many_pass_original_and_pass_many[False-expected_data1-expected_original_data1-data0]
tests/test_decorators.py::test_decorated_processors tests/test_decorators.py::TestPassOriginal::test_pass_original_single_no_mutation tests/test_decorators.py::TestPassOriginal::test_pass_original_single_with_mutation tests/test_decorators.py::TestPassOriginal::test_pass_original_many tests/test_decorators.py::test_decorated_processor_inheritance tests/test_decorators.py::test_pre_dump_is_invoked_before_implicit_field_generation tests/test_decorators.py::TestValidatesDecorator::test_validates tests/test_decorators.py::TestValidatesDecorator::test_validates_with_attribute tests/test_decorators.py::TestValidatesDecorator::test_validates_decorator tests/test_decorators.py::TestValidatesDecorator::test_field_not_present tests/test_decorators.py::TestValidatesDecorator::test_precedence tests/test_decorators.py::TestValidatesSchemaDecorator::test_validator_nested_many tests/test_decorators.py::TestValidatesSchemaDecorator::test_validator_nested_many_pass_original_and_pass_many[True-expected_data0-expected_original_data0-data0] tests/test_decorators.py::TestValidatesSchemaDecorator::test_decorated_validators tests/test_decorators.py::TestValidatesSchemaDecorator::test_multiple_validators tests/test_decorators.py::TestValidatesSchemaDecorator::test_passing_original_data tests/test_decorators.py::TestValidatesSchemaDecorator::test_allow_arbitrary_field_names_in_error tests/test_decorators.py::TestValidatesSchemaDecorator::test_skip_on_field_errors tests/test_decorators.py::test_decorator_error_handling tests/test_decorators.py::test_decorator_error_handling_with_load[pre_load] tests/test_decorators.py::test_decorator_error_handling_with_load[post_load] tests/test_decorators.py::test_decorator_error_handling_with_dump[pre_dump] tests/test_decorators.py::test_decorator_error_handling_with_dump[post_dump]
marshmallow/schema.py
marshmallow/schema.py