diff --git a/homeassistant/components/esphome/diagnostics.py b/homeassistant/components/esphome/diagnostics.py
new file mode 100644
index 00000000000..4d9b769791c
--- /dev/null
+++ b/homeassistant/components/esphome/diagnostics.py
@@ -0,0 +1,32 @@
+"""Diahgnostics support for ESPHome."""
+from __future__ import annotations
+
+from typing import Any, cast
+
+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 . import CONF_NOISE_PSK, DomainData
+
+CONF_MAC_ADDRESS = "mac_address"
+
+REDACT_KEYS = {CONF_NOISE_PSK, CONF_PASSWORD, CONF_MAC_ADDRESS}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    diag: dict[str, Any] = {}
+
+    diag["config"] = config_entry.as_dict()
+
+    entry_data = DomainData.get(hass).get_entry_data(config_entry)
+
+    if (storage_data := await entry_data.store.async_load()) is not None:
+        storage_data = cast("dict[str, Any]", storage_data)
+        diag["storage_data"] = storage_data
+
+    return async_redact_data(diag, REDACT_KEYS)
diff --git a/tests/components/esphome/conftest.py b/tests/components/esphome/conftest.py
index 91368044723..7cf25f13015 100644
--- a/tests/components/esphome/conftest.py
+++ b/tests/components/esphome/conftest.py
@@ -1,8 +1,42 @@
 """esphome session fixtures."""
-
 import pytest
 
+from homeassistant.components.esphome import CONF_NOISE_PSK, DOMAIN
+from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_PORT
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+
 
 @pytest.fixture(autouse=True)
 def esphome_mock_async_zeroconf(mock_async_zeroconf):
     """Auto mock zeroconf."""
+
+
+@pytest.fixture
+def mock_config_entry() -> MockConfigEntry:
+    """Return the default mocked config entry."""
+    return MockConfigEntry(
+        title="ESPHome Device",
+        domain=DOMAIN,
+        data={
+            CONF_HOST: "192.168.1.2",
+            CONF_PORT: 6053,
+            CONF_PASSWORD: "",
+            CONF_NOISE_PSK: "12345678123456781234567812345678",
+        },
+        unique_id="esphome-device",
+    )
+
+
+@pytest.fixture
+async def init_integration(
+    hass: HomeAssistant, mock_config_entry: MockConfigEntry
+) -> MockConfigEntry:
+    """Set up the ESPHome integration for testing."""
+    mock_config_entry.add_to_hass(hass)
+
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    return mock_config_entry
diff --git a/tests/components/esphome/test_diagnostics.py b/tests/components/esphome/test_diagnostics.py
new file mode 100644
index 00000000000..319bc2602e1
--- /dev/null
+++ b/tests/components/esphome/test_diagnostics.py
@@ -0,0 +1,26 @@
+"""Tests for the diagnostics data provided by the ESPHome integration."""
+
+from aiohttp import ClientSession
+
+from homeassistant.components.esphome import CONF_NOISE_PSK
+from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_PORT
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+
+
+async def test_diagnostics(
+    hass: HomeAssistant, hass_client: ClientSession, init_integration: MockConfigEntry
+):
+    """Test diagnostics for config entry."""
+    result = await get_diagnostics_for_config_entry(hass, hass_client, init_integration)
+
+    assert isinstance(result, dict)
+    assert result["config"]["data"] == {
+        CONF_HOST: "192.168.1.2",
+        CONF_PORT: 6053,
+        CONF_PASSWORD: "**REDACTED**",
+        CONF_NOISE_PSK: "**REDACTED**",
+    }
+    assert result["config"]["unique_id"] == "esphome-device"