diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9bfb9b7..9f8b47e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,9 @@ The types of changes are:
 
 ## [Unreleased](https://github.com/ethyca/fideslang/compare/3.0.9...main)
 
+### Deprecated
+- Deprecated `Cookies` model and `.cookies` property on `System` and `PrivacyDeclaration` [#199](https://github.com/IABTechLab/fideslang/pull/199)
+
 ## [3.0.9](https://github.com/ethyca/fideslang/compare/3.0.8...3.0.9)
 
 ### Added
diff --git a/src/fideslang/models.py b/src/fideslang/models.py
index b46ae16..ff7ac9f 100644
--- a/src/fideslang/models.py
+++ b/src/fideslang/models.py
@@ -8,6 +8,7 @@
 from datetime import datetime
 from enum import Enum
 from typing import Annotated, Dict, List, Optional, Union, Any
+from warnings import warn
 
 from packaging.version import InvalidVersion, Version
 from pydantic import (
@@ -283,15 +284,6 @@ class DataCategory(FidesModel, DefaultModel):
     _matching_parent_key: classmethod = matching_parent_key_validator
 
 
-class Cookies(BaseModel):
-    """The Cookies resource model"""
-
-    name: str
-    path: Optional[str] = None
-    domain: Optional[str] = None
-    model_config = ConfigDict(from_attributes=True)
-
-
 class DataSubjectRights(BaseModel):
     """
     The DataSubjectRights resource model.
@@ -806,7 +798,7 @@ class Policy(FidesModel):
     _sort_rules: classmethod = field_validator("rules")(sort_list_objects_by_name)  # type: ignore[assignment]
 
 
-class PrivacyDeclaration(BaseModel):
+class PrivacyDeclaration(BaseModel):  # type: ignore[misc]
     """
     The PrivacyDeclaration resource model.
 
@@ -879,12 +871,24 @@ class PrivacyDeclaration(BaseModel):
         default_factory=list,
         description="The categories of personal data that this system shares with third parties.",
     )
-    cookies: Optional[List[Cookies]] = Field(
+    cookies: Optional[Any] = Field(  # type: ignore
         default=None,
-        description="Cookies associated with this data use to deliver services and functionality",
+        description="Deprecated, do not use.",
+        deprecated=True,
     )
     model_config = ConfigDict(from_attributes=True)
 
+    @field_validator("cookies")
+    @classmethod
+    def validate_cookies(cls, value: Optional[Any]) -> None:  # type: ignore
+        """
+        Validate that the `cookies` field is deprecated and warn that it should not be used.
+        """
+        if value is not None:
+            warn(
+                "The 'cookies' field is deprecated and should not be used. Any value given as this field will be ignored."
+            )
+
 
 class SystemMetadata(BaseModel):
     """
@@ -968,7 +972,7 @@ def verify_type_is_flowable(cls, value: str) -> str:
         return value
 
 
-class System(FidesModel):
+class System(FidesModel):  # type: ignore[misc]
     """
     The System resource model.
 
@@ -1096,11 +1100,23 @@ class System(FidesModel):
         default=None,
         description="A URL that points to the system's publicly accessible legitimate interest disclosure.",
     )
-    cookies: Optional[List[Cookies]] = Field(
+    cookies: Optional[Any] = Field(  # type: ignore
         default=None,
-        description="System-level cookies unassociated with a data use to deliver services and functionality",
+        description="Deprecated, do not use.",
+        deprecated=True,
     )
 
+    @field_validator("cookies")
+    @classmethod
+    def validate_cookies(cls, value: Optional[Any]) -> None:  # type: ignore
+        """
+        Validate that the `cookies` field is deprecated and warn that it should not be used.
+        """
+        if value is not None:
+            warn(
+                "The 'cookies' field is deprecated and should not be used. Any value given as this field will be ignored."
+            )
+
     _sort_privacy_declarations: classmethod = field_validator("privacy_declarations")(  # type: ignore[assignment]
         sort_list_objects_by_name
     )
diff --git a/tests/fideslang/test_models.py b/tests/fideslang/test_models.py
index ff96123..aa84120 100644
--- a/tests/fideslang/test_models.py
+++ b/tests/fideslang/test_models.py
@@ -5,7 +5,6 @@
 from fideslang import DataFlow, Dataset, Organization, PrivacyDeclaration, System
 from fideslang.models import (
     ContactDetails,
-    Cookies,
     DataResponsibilityTitle,
     DatasetCollection,
     DatasetField,
@@ -133,6 +132,7 @@ def test_system_valid(self) -> None:
             system_type="SYSTEM",
             tags=["some", "tags"],
         )
+
         assert system.name == "Test System"
         assert system.fides_key == "test_system"
         assert system.description == "Test Policy"
@@ -152,7 +152,9 @@ def test_system_valid(self) -> None:
         ]
         assert system.meta == {"some": "meta stuff"}
         assert system.organization_fides_key == "1"
-        assert system.cookies == [Cookies(name="test_cookie", path=None, domain=None)]
+        assert (
+            system.cookies == None
+        ), "Cookies are deprecated and should be ignored on the model"
         assert system.system_type == "SYSTEM"
         assert system.tags == ["some", "tags"]
         assert system.privacy_declarations == [
@@ -174,7 +176,7 @@ def test_system_valid(self) -> None:
                 data_shared_with_third_parties=False,
                 third_parties=None,
                 shared_categories=[],
-                cookies=[Cookies(name="test_cookie", path="/", domain="example.com")],
+                cookies=None,  # Cookies are deprecated and should be ignored on the model
             )
         ]