diff --git a/homeassistant/components/litejet/diagnostics.py b/homeassistant/components/litejet/diagnostics.py
new file mode 100644
index 00000000000..b996dcc0413
--- /dev/null
+++ b/homeassistant/components/litejet/diagnostics.py
@@ -0,0 +1,22 @@
+"""Support for LiteJet diagnostics."""
+from typing import Any
+
+from pylitejet import LiteJet
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for LiteJet config entry."""
+    system: LiteJet = hass.data[DOMAIN]
+    return {
+        "loads": list(system.loads()),
+        "button_switches": list(system.button_switches()),
+        "scenes": list(system.scenes()),
+        "connected": system.connected,
+    }
diff --git a/tests/components/litejet/conftest.py b/tests/components/litejet/conftest.py
index 0805fd20231..4484c198d3c 100644
--- a/tests/components/litejet/conftest.py
+++ b/tests/components/litejet/conftest.py
@@ -68,5 +68,6 @@ def mock_litejet():
 
         mock_lj.start_time = dt_util.utcnow()
         mock_lj.last_delta = timedelta(0)
+        mock_lj.connected = True
 
         yield mock_lj
diff --git a/tests/components/litejet/test_diagnostics.py b/tests/components/litejet/test_diagnostics.py
new file mode 100644
index 00000000000..188acc8711e
--- /dev/null
+++ b/tests/components/litejet/test_diagnostics.py
@@ -0,0 +1,19 @@
+"""The tests for the litejet component."""
+from . import async_init_integration
+
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+
+
+async def test_diagnostics(hass, hass_client, mock_litejet):
+    """Test getting the LiteJet diagnostics."""
+
+    config_entry = await async_init_integration(hass)
+
+    diag = await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
+
+    assert diag == {
+        "loads": [1, 2],
+        "button_switches": [1, 2],
+        "scenes": [1, 2],
+        "connected": True,
+    }