diff --git a/custom_components/shopping_list_manager/__init__.py b/custom_components/shopping_list_manager/__init__.py
index e092b15..56cbb4d 100644
--- a/custom_components/shopping_list_manager/__init__.py
+++ b/custom_components/shopping_list_manager/__init__.py
@@ -6,6 +6,8 @@ import logging
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
 from homeassistant.components import websocket_api as ha_websocket
+from .websocket_api import websocket_create_list
+
 
 from .const import DOMAIN
 from .manager import ShoppingListManager
@@ -34,6 +36,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     hass.data[DOMAIN]["manager"] = manager
     
     # Register WebSocket commands using Home Assistant's websocket_api
+    ha_websocket.async_register_command(hass, websocket_create_list)
     ha_websocket.async_register_command(hass, websocket_add_product)
     ha_websocket.async_register_command(hass, websocket_set_qty)
     ha_websocket.async_register_command(hass, websocket_get_products)
@@ -50,4 +53,4 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
 async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Unload Shopping List Manager."""
     hass.data[DOMAIN].pop("manager", None)
-    return True
\ No newline at end of file
+    return True
diff --git a/custom_components/shopping_list_manager/manager.py b/custom_components/shopping_list_manager/manager.py
index cc7bf77..2dfd07f 100644
--- a/custom_components/shopping_list_manager/manager.py
+++ b/custom_components/shopping_list_manager/manager.py
@@ -207,6 +207,34 @@ class ShoppingListManager:
     # PUBLIC API - All operations enforce invariants
     # ========================================================================
     
+    import time
+
+    async def async_create_list(
+        self,
+        list_id: str,
+        catalogue: str,
+        owner: str,
+        visibility: str = "shared",
+    ):
+        await self._ensure_catalogues_loaded()
+        await self._ensure_lists_loaded()
+
+        if list_id in self._lists:
+            raise ValueError(f"List '{list_id}' already exists")
+
+        if catalogue not in self._catalogues:
+            raise ValueError(f"Catalogue '{catalogue}' does not exist")
+
+        self._lists[list_id] = {
+            "catalogue": catalogue,
+            "owner": owner,
+            "visibility": visibility,
+            "created_at": time.time(),
+            "updated_at": time.time(),
+        }
+
+        await self._store_lists.async_save(self._lists)
+
     async def async_add_product(
         self,
         list_id: str,
@@ -375,4 +403,4 @@ class ShoppingListManager:
     # and would need updating to support per-list structure:
     # - async_get_full_state()
     # - get_product()
-    # - get_active_qty()
\ No newline at end of file
+    # - get_active_qty()
diff --git a/custom_components/shopping_list_manager/websocket_api.py b/custom_components/shopping_list_manager/websocket_api.py
index f7d61dc..da53906 100644
--- a/custom_components/shopping_list_manager/websocket_api.py
+++ b/custom_components/shopping_list_manager/websocket_api.py
@@ -10,6 +10,33 @@ from .models import InvariantError
 
 _LOGGER = logging.getLogger(__name__)
 
+@websocket_api.websocket_command({
+    vol.Required("type"): "shopping_list_manager/create_list",
+    vol.Required("list_id"): str,
+    vol.Required("catalogue"): str,
+    vol.Optional("visibility", default="shared"): vol.In(["shared", "private"]),
+})
+@websocket_api.async_response
+async def websocket_create_list(
+    hass: HomeAssistant,
+    connection: websocket_api.ActiveConnection,
+    msg: dict,
+) -> None:
+    manager = hass.data[DOMAIN]["manager"]
+
+    try:
+        await manager.async_create_list(
+            list_id=msg["list_id"],
+            catalogue=msg["catalogue"],
+            owner=connection.user.id,
+            visibility=msg.get("visibility", "shared"),
+        )
+
+        connection.send_result(msg["id"], {"success": True})
+
+    except Exception as err:
+        connection.send_error(msg["id"], "create_list_failed", str(err))
+
 
 @websocket_api.websocket_command({
     vol.Required("type"): "shopping_list_manager/add_product",
@@ -295,4 +322,4 @@ async def websocket_delete_product(
         
     except Exception as err:
         _LOGGER.error("Error deleting product from list '%s': %s", list_id, err)
-        connection.send_error(msg["id"], "delete_product_failed", str(err))
\ No newline at end of file
+        connection.send_error(msg["id"], "delete_product_failed", str(err))