diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c7dca0..8696dd4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [x.x.x] - Unreleased
 
+### Added
+
+- Support for PUT /sheets/{sheetId}/dataclassification endpoint (Set Data Classification)
+- Support for DELETE /sheets/{sheetId}/dataclassification endpoint (Remove Data Classification)
+- Added `data_classification` field to Sheet model
+
 ## [3.9.0] - 2026-04-30
 
 ### Added
diff --git a/smartsheet/models/__init__.py b/smartsheet/models/__init__.py
index fb31a11..d46976d 100644
--- a/smartsheet/models/__init__.py
+++ b/smartsheet/models/__init__.py
@@ -43,6 +43,7 @@
 from .criteria import Criteria
 from .cross_sheet_reference import CrossSheetReference
 from .currency import Currency
+from .data_classification import DataClassification
 from .date_object_value import DateObjectValue
 from .discussion import Discussion
 from .downloaded_file import DownloadedFile
diff --git a/smartsheet/models/data_classification.py b/smartsheet/models/data_classification.py
new file mode 100644
index 0000000..dc6c87f
--- /dev/null
+++ b/smartsheet/models/data_classification.py
@@ -0,0 +1,57 @@
+# pylint: disable=C0111,R0902,R0904,R0912,R0913,R0915,E1101
+# Smartsheet Python SDK.
+#
+# Copyright 2018 Smartsheet.com, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"): you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from __future__ import absolute_import
+
+from ..types import EnumeratedValue, json
+from ..util import deserialize, serialize
+from .enums import DataClassificationType
+
+
+class DataClassification:
+
+    """Smartsheet DataClassification data model."""
+
+    def __init__(self, props=None, base_obj=None):
+        """Initialize the DataClassification model."""
+        self._base = None
+        if base_obj is not None:
+            self._base = base_obj
+
+        self._data_classification = EnumeratedValue(DataClassificationType)
+
+        if props:
+            deserialize(self, props)
+
+        self.request_response = None
+
+    @property
+    def data_classification(self):
+        return self._data_classification
+
+    @data_classification.setter
+    def data_classification(self, value):
+        self._data_classification.set(value)
+
+    def to_dict(self):
+        return serialize(self)
+
+    def to_json(self):
+        return json.dumps(self.to_dict())
+
+    def __str__(self):
+        return self.to_json()
diff --git a/smartsheet/models/enums/__init__.py b/smartsheet/models/enums/__init__.py
index 35a8eb8..9768086 100644
--- a/smartsheet/models/enums/__init__.py
+++ b/smartsheet/models/enums/__init__.py
@@ -31,6 +31,7 @@
 from .criteria_target import CriteriaTarget
 from .cross_sheet_reference_status import CrossSheetReferenceStatus
 from .currency_code import CurrencyCode
+from .data_classification_type import DataClassificationType
 from .day_descriptors import DayDescriptors
 from .day_ordinal import DayOrdinal
 from .event_action import EventAction
diff --git a/smartsheet/models/enums/data_classification_type.py b/smartsheet/models/enums/data_classification_type.py
new file mode 100644
index 0000000..4168ff3
--- /dev/null
+++ b/smartsheet/models/enums/data_classification_type.py
@@ -0,0 +1,24 @@
+# pylint: disable=C0111,R0902,R0904,R0912,R0913,R0915,E1101
+# Smartsheet Python SDK.
+#
+# Copyright 2018 Smartsheet.com, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"): you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+from enum import Enum
+
+
+class DataClassificationType(Enum):
+    PUBLIC = 'PUBLIC'
+    INTERNAL = 'INTERNAL'
+    CONFIDENTIAL = 'CONFIDENTIAL'
+    SECRET = 'SECRET'
diff --git a/smartsheet/models/sheet.py b/smartsheet/models/sheet.py
index ab5417e..4f8f86f 100644
--- a/smartsheet/models/sheet.py
+++ b/smartsheet/models/sheet.py
@@ -26,7 +26,7 @@
 from .contact_object_value import ContactObjectValue
 from .cross_sheet_reference import CrossSheetReference
 from .discussion import Discussion
-from .enums import AccessLevel, AttachmentType
+from .enums import AccessLevel, AttachmentType, DataClassificationType
 from .project_settings import ProjectSettings
 from .row import Row
 from .sheet_filter import SheetFilter
@@ -57,6 +57,7 @@ def __init__(self, props=None, base_obj=None):
         self._contact_references = TypedList(ContactObjectValue)
         self._created_at = Timestamp()
         self._cross_sheet_references = TypedList(CrossSheetReference)
+        self._data_classification = EnumeratedValue(DataClassificationType)
         self._dependencies_enabled = Boolean()
         self._discussions = TypedList(Discussion)
         self._effective_attachment_options = EnumeratedList(AttachmentType)
@@ -151,6 +152,14 @@ def cross_sheet_references(self):
     def cross_sheet_references(self, value):
         self._cross_sheet_references.load(value)
 
+    @property
+    def data_classification(self):
+        return self._data_classification
+
+    @data_classification.setter
+    def data_classification(self, value):
+        self._data_classification.set(value)
+
     @property
     def dependencies_enabled(self):
         return self._dependencies_enabled.value
diff --git a/smartsheet/sheets.py b/smartsheet/sheets.py
index aa473db..33d329c 100644
--- a/smartsheet/sheets.py
+++ b/smartsheet/sheets.py
@@ -282,7 +282,7 @@ def delete_column(self, sheet_id, column_id) -> Union[Result[None], Error]:
         return response
 
     def delete_rows(self, sheet_id, ids, ignore_rows_not_found=False) -> Union[Result[List[NumberObjectValue]], Error]:
-        """Deletes one or more Row(s) from the specified Sheeet.
+        """Deletes one or more Row(s) from the specified Sheet.
 
         Args:
             sheet_id (int): Sheet ID
@@ -334,6 +334,47 @@ def delete_share(self, sheet_id, share_id) -> Union[Result[None], Error]:
 
         return response
 
+    def set_data_classification(self, sheet_id, data_classification_obj) -> Union[Result[None], Error]:
+        """Sets the data classification on a Sheet.
+
+        Args:
+            sheet_id (int): Sheet ID
+            data_classification_obj
+                (DataClassification): DataClassification object.
+
+        Returns:
+            Union[Result[None], Error]: The result of the operation, or an Error object if the request fails.
+        """
+        _op = fresh_operation("set_data_classification")
+        _op["method"] = "PUT"
+        _op["path"] = "/sheets/" + str(sheet_id) + "/dataclassification"
+        _op["json"] = data_classification_obj
+
+        expected = ["Result", None]
+        prepped_request = self._base.prepare_request(_op)
+        response = self._base.request(prepped_request, expected, _op)
+
+        return response
+
+    def delete_data_classification(self, sheet_id) -> Union[Result[None], Error]:
+        """Removes the data classification from a Sheet. Requires ADMIN or OWNER access.
+
+        Args:
+            sheet_id (int): Sheet ID
+
+        Returns:
+            Union[Result[None], Error]: The result of the operation, or an Error object if the request fails.
+        """
+        _op = fresh_operation("delete_data_classification")
+        _op["method"] = "DELETE"
+        _op["path"] = "/sheets/" + str(sheet_id) + "/dataclassification"
+
+        expected = ["Result", None]
+        prepped_request = self._base.prepare_request(_op)
+        response = self._base.request(prepped_request, expected, _op)
+
+        return response
+
     def delete_sheet(self, sheet_id) -> Union[Result[None], Error]:
         """Delete the specified Sheet.
 
diff --git a/tests/mock_api/sheets/__init__.py b/tests/mock_api/sheets/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/mock_api/sheets/common_test_constants.py b/tests/mock_api/sheets/common_test_constants.py
new file mode 100644
index 0000000..0d7ef7d
--- /dev/null
+++ b/tests/mock_api/sheets/common_test_constants.py
@@ -0,0 +1,3 @@
+TEST_SHEET_ID = 1234567890123456
+TEST_SUCCESS_MESSAGE = "SUCCESS"
+TEST_RESULT_CODE = 0
diff --git a/tests/mock_api/sheets/test_delete_data_classification.py b/tests/mock_api/sheets/test_delete_data_classification.py
new file mode 100644
index 0000000..7a9460d
--- /dev/null
+++ b/tests/mock_api/sheets/test_delete_data_classification.py
@@ -0,0 +1,64 @@
+import uuid
+from urllib.parse import urlparse
+
+from smartsheet.models import Error
+from tests.mock_api.sheets.common_test_constants import TEST_SHEET_ID, TEST_SUCCESS_MESSAGE, TEST_RESULT_CODE
+from tests.mock_api.mock_api_test_helper import (
+    get_mock_api_client,
+    get_wiremock_request,
+)
+
+
+def test_delete_data_classification_generated_url_is_correct():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/sheets/delete-data-classification/all-response-body-properties", request_id
+    )
+
+    client.Sheets.delete_data_classification(
+        sheet_id=TEST_SHEET_ID,
+    )
+
+    wiremock_request = get_wiremock_request(request_id)
+    url = urlparse(wiremock_request["absoluteUrl"])
+    assert url.path == f'/2.0/sheets/{TEST_SHEET_ID}/dataclassification'
+
+
+def test_delete_data_classification_all_response_properties():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/sheets/delete-data-classification/all-response-body-properties", request_id
+    )
+
+    response = client.Sheets.delete_data_classification(
+        sheet_id=TEST_SHEET_ID,
+    )
+
+    assert response.message == TEST_SUCCESS_MESSAGE
+    assert response.result_code == TEST_RESULT_CODE
+
+
+def test_delete_data_classification_error_4xx():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/errors/400-response", request_id
+    )
+
+    response = client.Sheets.delete_data_classification(
+        sheet_id=TEST_SHEET_ID,
+    )
+
+    assert isinstance(response, Error)
+
+
+def test_delete_data_classification_error_5xx():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/errors/500-response", request_id
+    )
+
+    response = client.Sheets.delete_data_classification(
+        sheet_id=TEST_SHEET_ID,
+    )
+
+    assert isinstance(response, Error)
diff --git a/tests/mock_api/sheets/test_set_data_classification.py b/tests/mock_api/sheets/test_set_data_classification.py
new file mode 100644
index 0000000..bb722e6
--- /dev/null
+++ b/tests/mock_api/sheets/test_set_data_classification.py
@@ -0,0 +1,82 @@
+import json
+import uuid
+from urllib.parse import urlparse
+
+from smartsheet.models import Error
+from smartsheet.models.data_classification import DataClassification
+from tests.mock_api.sheets.common_test_constants import TEST_SHEET_ID, TEST_SUCCESS_MESSAGE, TEST_RESULT_CODE
+from tests.mock_api.mock_api_test_helper import (
+    get_mock_api_client,
+    get_wiremock_request,
+)
+
+
+def test_set_data_classification_generated_url_is_correct():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/sheets/set-data-classification/all-response-body-properties", request_id
+    )
+
+    data_classification_obj = DataClassification({"dataClassification": "CONFIDENTIAL"})
+
+    client.Sheets.set_data_classification(
+        sheet_id=TEST_SHEET_ID,
+        data_classification_obj=data_classification_obj,
+    )
+
+    wiremock_request = get_wiremock_request(request_id)
+    url = urlparse(wiremock_request["absoluteUrl"])
+    assert url.path == f'/2.0/sheets/{TEST_SHEET_ID}/dataclassification'
+
+
+def test_set_data_classification_all_response_properties():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/sheets/set-data-classification/all-response-body-properties", request_id
+    )
+
+    data_classification_obj = DataClassification({"dataClassification": "CONFIDENTIAL"})
+
+    response = client.Sheets.set_data_classification(
+        sheet_id=TEST_SHEET_ID,
+        data_classification_obj=data_classification_obj,
+    )
+
+    assert response.message == TEST_SUCCESS_MESSAGE
+    assert response.result_code == TEST_RESULT_CODE
+
+    wiremock_request = get_wiremock_request(request_id)
+    body = json.loads(wiremock_request["body"])
+    assert body == {"dataClassification": "CONFIDENTIAL"}
+
+
+def test_set_data_classification_error_4xx():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/errors/400-response", request_id
+    )
+
+    data_classification_obj = DataClassification({"dataClassification": "CONFIDENTIAL"})
+
+    response = client.Sheets.set_data_classification(
+        sheet_id=TEST_SHEET_ID,
+        data_classification_obj=data_classification_obj,
+    )
+
+    assert isinstance(response, Error)
+
+
+def test_set_data_classification_error_5xx():
+    request_id = uuid.uuid4().hex
+    client = get_mock_api_client(
+        "/errors/500-response", request_id
+    )
+
+    data_classification_obj = DataClassification({"dataClassification": "CONFIDENTIAL"})
+
+    response = client.Sheets.set_data_classification(
+        sheet_id=TEST_SHEET_ID,
+        data_classification_obj=data_classification_obj,
+    )
+
+    assert isinstance(response, Error)