diff --git a/homeassistant/components/fully_kiosk/diagnostics.py b/homeassistant/components/fully_kiosk/diagnostics.py
new file mode 100644
index 00000000000..89a894d5353
--- /dev/null
+++ b/homeassistant/components/fully_kiosk/diagnostics.py
@@ -0,0 +1,64 @@
+"""Provides diagnostics for Fully Kiosk Browser."""
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics.util import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr
+
+from .const import DOMAIN
+
+DEVICE_INFO_TO_REDACT = {
+    "serial",
+    "Mac",
+    "ip6",
+    "hostname6",
+    "ip4",
+    "hostname4",
+    "deviceID",
+    "startUrl",
+    "currentPage",
+    "SSID",
+    "BSSID",
+}
+SETTINGS_TO_REDACT = {
+    "startURL",
+    "mqttBrokerPassword",
+    "mqttBrokerUsername",
+    "remoteAdminPassword",
+    "wifiKey",
+    "authPassword",
+    "authUsername",
+    "mqttBrokerUrl",
+    "kioskPin",
+    "wifiSSID",
+    "screensaverWallpaperURL",
+    "barcodeScanTargetUrl",
+    "launcherBgUrl",
+    "clientCaUrl",
+    "urlWhitelist",
+    "alarmSoundFileUrl",
+    "errorURL",
+    "actionBarIconUrl",
+    "kioskWifiPin",
+    "knoxApnConfig",
+    "injectJsCode",
+    "mdmApnConfig",
+    "mdmProxyConfig",
+    "wifiEnterpriseIdentity",
+    "sebExamKey",
+    "sebConfigKey",
+    "kioskPinEnc",
+}
+
+
+async def async_get_device_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry, device: dr.DeviceEntry
+) -> dict[str, Any]:
+    """Return device diagnostics."""
+    coordinator = hass.data[DOMAIN][entry.entry_id]
+    data = coordinator.data
+    data["settings"] = async_redact_data(data["settings"], SETTINGS_TO_REDACT)
+    return async_redact_data(data, DEVICE_INFO_TO_REDACT)
diff --git a/tests/components/fully_kiosk/test_diagnostics.py b/tests/components/fully_kiosk/test_diagnostics.py
new file mode 100644
index 00000000000..8136147fb6a
--- /dev/null
+++ b/tests/components/fully_kiosk/test_diagnostics.py
@@ -0,0 +1,43 @@
+"""Test the Fully Kiosk Browser diagnostics."""
+from unittest.mock import MagicMock
+
+from aiohttp import ClientSession
+
+from homeassistant.components.diagnostics.const import REDACTED
+from homeassistant.components.fully_kiosk.const import DOMAIN
+from homeassistant.components.fully_kiosk.diagnostics import (
+    DEVICE_INFO_TO_REDACT,
+    SETTINGS_TO_REDACT,
+)
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_device
+
+
+async def test_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSession,
+    mock_fully_kiosk: MagicMock,
+    init_integration: MockConfigEntry,
+) -> None:
+    """Test Fully Kiosk diagnostics."""
+
+    device_registry = dr.async_get(hass)
+    device = device_registry.async_get_device({(DOMAIN, "abcdef-123456")})
+
+    diagnostics = await get_diagnostics_for_device(
+        hass, hass_client, init_integration, device
+    )
+
+    assert diagnostics
+    for key in DEVICE_INFO_TO_REDACT:
+        if hasattr(diagnostics, key):
+            assert diagnostics[key] == REDACTED
+    for key in SETTINGS_TO_REDACT:
+        if hasattr(diagnostics["settings"], key):
+            assert (
+                diagnostics["settings"][key] == REDACTED
+                or diagnostics["settings"][key] == ""
+            )