diff --git a/custom_components/spook/ectoplasms/homeassistant/services/add_label_to_entity.py b/custom_components/spook/ectoplasms/homeassistant/services/add_label_to_entity.py
new file mode 100644
index 00000000..b79d430d
--- /dev/null
+++ b/custom_components/spook/ectoplasms/homeassistant/services/add_label_to_entity.py
@@ -0,0 +1,46 @@
+"""Spook - Your homie."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+import voluptuous as vol
+
+from homeassistant.components.homeassistant import DOMAIN
+from homeassistant.exceptions import HomeAssistantError
+from homeassistant.helpers import (
+    config_validation as cv,
+    entity_registry as er,
+    label_registry as lr,
+)
+
+from ....services import AbstractSpookAdminService
+
+if TYPE_CHECKING:
+    from homeassistant.core import ServiceCall
+
+
+class SpookService(AbstractSpookAdminService):
+    """Home Assistant service to add a label to an entity."""
+
+    domain = DOMAIN
+    service = "add_label_to_entity"
+    schema = {
+        vol.Required("label_id"): vol.All(cv.ensure_list, [cv.string]),
+        vol.Required("entity_id"): vol.All(cv.ensure_list, [cv.string]),
+    }
+
+    async def async_handle_service(self, call: ServiceCall) -> None:
+        """Handle the service call."""
+        label_registry = lr.async_get(self.hass)
+        for label_id in call.data["label_id"]:
+            if not label_registry.async_get_label(label_id):
+                msg = f"Label {label_id} not found"
+                raise HomeAssistantError(msg)
+
+        entity_registry = er.async_get(self.hass)
+        for entity_id in call.data["entity_id"]:
+            if entity_entry := entity_registry.async_get(entity_id):
+                labels = entity_entry.labels.copy()
+                labels.update(call.data["label_id"])
+                entity_registry.async_update_entity(entity_id, labels=labels)
diff --git a/custom_components/spook/services.yaml b/custom_components/spook/services.yaml
index e5ac4fc1..ea111c2c 100644
--- a/custom_components/spook/services.yaml
+++ b/custom_components/spook/services.yaml
@@ -557,6 +557,27 @@ homeassistant_add_label_to_device:
         device:
           multiple: true
 
+homeassistant_add_label_to_entity:
+  name: Add a label to an entity 👻
+  description: >-
+    Adds a label to an entity. If multiple labels or multiple entities are
+    provided, all combinations will be added.
+  fields:
+    label_id:
+      name: Label ID
+      description: The ID(s) of the label(s) to add the entity/entities.
+      required: true
+      selector:
+        label:
+          multiple: true
+    entity_id:
+      name: Entity ID
+      description: The ID(s) of the entity/entities to add the label(s) to.
+      required: true
+      selector:
+        entity:
+          multiple: true
+
 homeassistant_delete_label:
   name: Delete a label 👻
   description: >-