diff --git a/homeassistant/helpers/entity_registry.py b/homeassistant/helpers/entity_registry.py
index 6e68d4f5499..f4b733eac56 100644
--- a/homeassistant/helpers/entity_registry.py
+++ b/homeassistant/helpers/entity_registry.py
@@ -39,7 +39,7 @@ from homeassistant.exceptions import MaxLengthExceeded
 from homeassistant.helpers import device_registry as dr, storage
 from homeassistant.helpers.device_registry import EVENT_DEVICE_REGISTRY_UPDATED
 from homeassistant.loader import bind_hass
-from homeassistant.util import slugify
+from homeassistant.util import slugify, uuid as uuid_util
 from homeassistant.util.yaml import load_yaml
 
 from .typing import UNDEFINED, UndefinedType
@@ -59,7 +59,7 @@ DISABLED_INTEGRATION = "integration"
 DISABLED_USER = "user"
 
 STORAGE_VERSION_MAJOR = 1
-STORAGE_VERSION_MINOR = 3
+STORAGE_VERSION_MINOR = 4
 STORAGE_KEY = "core.entity_registry"
 
 # Attributes relevant to describing entity
@@ -103,6 +103,7 @@ class RegistryEntry:
     )
     entity_category: str | None = attr.ib(default=None)
     icon: str | None = attr.ib(default=None)
+    id: str = attr.ib(factory=uuid_util.random_uuid_hex)
     name: str | None = attr.ib(default=None)
     # As set by integration
     original_device_class: str | None = attr.ib(default=None)
@@ -558,6 +559,7 @@ class EntityRegistry:
                     entity_category=entity["entity_category"],
                     entity_id=entity["entity_id"],
                     icon=entity["icon"],
+                    id=entity["id"],
                     name=entity["name"],
                     original_device_class=entity["original_device_class"],
                     original_icon=entity["original_icon"],
@@ -592,6 +594,7 @@ class EntityRegistry:
                 "entity_category": entry.entity_category,
                 "entity_id": entry.entity_id,
                 "icon": entry.icon,
+                "id": entry.id,
                 "name": entry.name,
                 "original_device_class": entry.original_device_class,
                 "original_icon": entry.original_icon,
@@ -752,12 +755,17 @@ async def _async_migrate(
             entity["unit_of_measurement"] = entity.get("unit_of_measurement")
 
     if old_major_version < 2 and old_minor_version < 3:
-        # From version 1.2
+        # Version 1.3 adds original_device_class
         for entity in data["entities"]:
             # Move device_class to original_device_class
             entity["original_device_class"] = entity["device_class"]
             entity["device_class"] = None
 
+    if old_major_version < 2 and old_minor_version < 4:
+        # Version 1.4 adds id
+        for entity in data["entities"]:
+            entity["id"] = uuid_util.random_uuid_hex()
+
     if old_major_version > 1:
         raise NotImplementedError
     return data
diff --git a/tests/helpers/test_entity_platform.py b/tests/helpers/test_entity_platform.py
index 11cbc78ed71..e367fa248d5 100644
--- a/tests/helpers/test_entity_platform.py
+++ b/tests/helpers/test_entity_platform.py
@@ -2,7 +2,7 @@
 import asyncio
 from datetime import timedelta
 import logging
-from unittest.mock import Mock, patch
+from unittest.mock import ANY, Mock, patch
 
 import pytest
 
@@ -1108,6 +1108,7 @@ async def test_entity_info_added_to_entity_registry(hass):
         device_class=None,
         entity_category="config",
         icon=None,
+        id=ANY,
         name=None,
         original_device_class="mock-device-class",
         original_icon="nice:icon",
diff --git a/tests/helpers/test_entity_registry.py b/tests/helpers/test_entity_registry.py
index 00900e013c0..ad88a23f76f 100644
--- a/tests/helpers/test_entity_registry.py
+++ b/tests/helpers/test_entity_registry.py
@@ -96,6 +96,7 @@ def test_get_or_create_updates_data(registry):
         disabled_by=er.DISABLED_HASS,
         entity_category="config",
         icon=None,
+        id=orig_entry.id,
         name=None,
         original_device_class="mock-device-class",
         original_icon="initial-original_icon",
@@ -135,6 +136,7 @@ def test_get_or_create_updates_data(registry):
         disabled_by=er.DISABLED_HASS,  # Should not be updated
         entity_category="config",
         icon=None,
+        id=orig_entry.id,
         name=None,
         original_device_class="new-mock-device-class",
         original_icon="updated-original_icon",
@@ -418,8 +420,8 @@ async def test_migration_yaml_to_json(hass):
 
 
 @pytest.mark.parametrize("load_registries", [False])
-async def test_migration_1_1_to_1_2(hass, hass_storage):
-    """Test migration from version 1.1 to 1.2."""
+async def test_migration_1_1(hass, hass_storage):
+    """Test migration from version 1.1."""
     hass_storage[er.STORAGE_KEY] = {
         "version": 1,
         "minor_version": 1,