diff --git a/homeassistant/components/homeassistant_connect_zbt2/diagnostics.py b/homeassistant/components/homeassistant_connect_zbt2/diagnostics.py
new file mode 100644
index 00000000000000..dcbd19675025a2
--- /dev/null
+++ b/homeassistant/components/homeassistant_connect_zbt2/diagnostics.py
@@ -0,0 +1,13 @@
+"""Provides diagnostics for the Home Assistant Connect ZBT-2 integration."""
+
+from typing import Any
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    return {"config_entry": config_entry.as_dict()}
diff --git a/tests/components/homeassistant_connect_zbt2/snapshots/test_diagnostics.ambr b/tests/components/homeassistant_connect_zbt2/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000000..b1f447d81cefc9
--- /dev/null
+++ b/tests/components/homeassistant_connect_zbt2/snapshots/test_diagnostics.ambr
@@ -0,0 +1,32 @@
+# serializer version: 1
+# name: test_diagnostics_for_config_entry
+  dict({
+    'config_entry': dict({
+      'data': dict({
+        'device': '/dev/serial/by-id/usb-Nabu_Casa_ZBT-2_80B54EEFAE18-if01-port0',
+        'firmware': 'ezsp',
+        'firmware_version': '7.3.1.0 build 0',
+        'manufacturer': 'Nabu Casa',
+        'pid': '4001',
+        'product': 'ZBT-2',
+        'serial_number': '80B54EEFAE18',
+        'vid': '303A',
+      }),
+      'disabled_by': None,
+      'discovery_keys': dict({
+      }),
+      'domain': 'homeassistant_connect_zbt2',
+      'minor_version': 1,
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'user',
+      'subentries': list([
+      ]),
+      'title': 'Mock Title',
+      'unique_id': None,
+      'version': 1,
+    }),
+  })
+# ---
diff --git a/tests/components/homeassistant_connect_zbt2/test_diagnostics.py b/tests/components/homeassistant_connect_zbt2/test_diagnostics.py
new file mode 100644
index 00000000000000..e64dda6d110778
--- /dev/null
+++ b/tests/components/homeassistant_connect_zbt2/test_diagnostics.py
@@ -0,0 +1,51 @@
+"""Tests for the diagnostics data provided by the Home Assistant Connect ZBT-2 integration."""
+
+from syrupy.assertion import SnapshotAssertion
+from syrupy.filters import props
+
+from homeassistant.core import HomeAssistant
+from homeassistant.setup import async_setup_component
+
+from .common import USB_DATA_ZBT2
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_diagnostics_for_config_entry(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics for config entry."""
+    await async_setup_component(hass, "homeassistant", {})
+
+    # Set up the ZBT-2 integration
+    zbt2_config_entry = MockConfigEntry(
+        domain="homeassistant_connect_zbt2",
+        data={
+            "firmware": "ezsp",
+            "firmware_version": "7.3.1.0 build 0",
+            "device": USB_DATA_ZBT2.device,
+            "manufacturer": USB_DATA_ZBT2.manufacturer,
+            "pid": USB_DATA_ZBT2.pid,
+            "product": USB_DATA_ZBT2.description,
+            "serial_number": USB_DATA_ZBT2.serial_number,
+            "vid": USB_DATA_ZBT2.vid,
+        },
+        version=1,
+        minor_version=1,
+    )
+    zbt2_config_entry.add_to_hass(hass)
+
+    assert await hass.config_entries.async_setup(zbt2_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    diagnostics_data = await get_diagnostics_for_config_entry(
+        hass, hass_client, zbt2_config_entry
+    )
+
+    assert diagnostics_data == snapshot(
+        exclude=props("created_at", "modified_at", "entry_id")
+    )