diff --git a/homeassistant/components/onewire/diagnostics.py b/homeassistant/components/onewire/diagnostics.py
new file mode 100644
index 00000000000..a02ff2d8e47
--- /dev/null
+++ b/homeassistant/components/onewire/diagnostics.py
@@ -0,0 +1,33 @@
+"""Diagnostics support for 1-Wire."""
+from __future__ import annotations
+
+from dataclasses import asdict
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_HOST
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .onewirehub import OneWireHub
+
+TO_REDACT = {CONF_HOST}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    onewirehub: OneWireHub = hass.data[DOMAIN][entry.entry_id]
+
+    return {
+        "entry": {
+            "title": entry.title,
+            "data": async_redact_data(entry.data, TO_REDACT),
+            "options": {**entry.options},
+        },
+        "devices": [asdict(device_details) for device_details in onewirehub.devices]
+        if onewirehub.devices
+        else [],
+    }
diff --git a/tests/components/onewire/test_diagnostics.py b/tests/components/onewire/test_diagnostics.py
new file mode 100644
index 00000000000..bc164a9b138
--- /dev/null
+++ b/tests/components/onewire/test_diagnostics.py
@@ -0,0 +1,61 @@
+"""Test 1-Wire diagnostics."""
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from homeassistant.components.diagnostics import REDACTED
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import Platform
+from homeassistant.core import HomeAssistant
+
+from . import setup_owproxy_mock_devices
+
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+
+
+@pytest.fixture(autouse=True)
+def override_platforms():
+    """Override PLATFORMS."""
+    with patch("homeassistant.components.onewire.PLATFORMS", [Platform.SWITCH]):
+        yield
+
+
+DEVICE_DETAILS = {
+    "device_info": {
+        "identifiers": [["onewire", "EF.111111111113"]],
+        "manufacturer": "Hobby Boards",
+        "model": "HB_HUB",
+        "name": "EF.111111111113",
+    },
+    "family": "EF",
+    "id": "EF.111111111113",
+    "path": "/EF.111111111113/",
+    "type": "HB_HUB",
+}
+
+
+@pytest.mark.parametrize("device_id", ["EF.111111111113"], indirect=True)
+async def test_entry_diagnostics(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    hass_client,
+    owproxy: MagicMock,
+    device_id: str,
+):
+    """Test config entry diagnostics."""
+    setup_owproxy_mock_devices(owproxy, Platform.SENSOR, [device_id])
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert await get_diagnostics_for_config_entry(hass, hass_client, config_entry) == {
+        "entry": {
+            "data": {
+                "host": REDACTED,
+                "port": 1234,
+                "type": "OWServer",
+            },
+            "options": {},
+            "title": "Mock Title",
+        },
+        "devices": [DEVICE_DETAILS],
+    }