diff --git a/homeassistant/components/sma/diagnostics.py b/homeassistant/components/sma/diagnostics.py
new file mode 100644
index 00000000000..9c17cb0d2a9
--- /dev/null
+++ b/homeassistant/components/sma/diagnostics.py
@@ -0,0 +1,35 @@
+"""Diagnostics support for SMA."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_PASSWORD
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import entity_registry as er
+
+TO_REDACT = {CONF_PASSWORD}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for the config entry."""
+    ent_reg = er.async_get(hass)
+    entities = [
+        entity.entity_id
+        for entity in er.async_entries_for_config_entry(ent_reg, entry.entry_id)
+    ]
+
+    entity_states = {entity: hass.states.get(entity) for entity in entities}
+
+    entry_dict = entry.as_dict()
+    if "data" in entry_dict:
+        entry_dict["data"] = async_redact_data(entry_dict["data"], TO_REDACT)
+
+    return {
+        "entry": entry_dict,
+        "entities": entity_states,
+    }
diff --git a/tests/components/sma/snapshots/test_diagnostics.ambr b/tests/components/sma/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..c7de3851b5f
--- /dev/null
+++ b/tests/components/sma/snapshots/test_diagnostics.ambr
@@ -0,0 +1,29 @@
+# serializer version: 1
+# name: test_get_config_entry_diagnostics
+  dict({
+    'entities': dict({
+    }),
+    'entry': dict({
+      'data': dict({
+        'group': 'user',
+        'host': '1.1.1.1',
+        'password': '**REDACTED**',
+        'ssl': True,
+        'verify_ssl': False,
+      }),
+      'disabled_by': None,
+      'discovery_keys': dict({
+      }),
+      'domain': 'sma',
+      'minor_version': 2,
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'import',
+      'title': 'SMA Device Name',
+      'unique_id': '123456789',
+      'version': 1,
+    }),
+  })
+# ---
diff --git a/tests/components/sma/test_diagnostics.py b/tests/components/sma/test_diagnostics.py
new file mode 100644
index 00000000000..6c1fe0dc5cb
--- /dev/null
+++ b/tests/components/sma/test_diagnostics.py
@@ -0,0 +1,29 @@
+"""Test the SMA diagnostics."""
+
+from syrupy import SnapshotAssertion
+from syrupy.filters import props
+
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_get_config_entry_diagnostics(
+    hass: HomeAssistant,
+    snapshot: SnapshotAssertion,
+    hass_client: ClientSessionGenerator,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test if get_config_entry_diagnostics returns the correct data."""
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    diagnostics = await get_diagnostics_for_config_entry(
+        hass, hass_client, mock_config_entry
+    )
+    assert diagnostics == snapshot(
+        exclude=props("created_at", "modified_at", "entry_id")
+    )