diff --git a/homeassistant/components/apcupsd/diagnostics.py b/homeassistant/components/apcupsd/diagnostics.py
new file mode 100644
index 00000000000..60433dfbdf4
--- /dev/null
+++ b/homeassistant/components/apcupsd/diagnostics.py
@@ -0,0 +1,22 @@
+"""Diagnostics support for APCUPSD."""
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .coordinator import APCUPSdCoordinator, APCUPSdData
+
+TO_REDACT = {"SERIALNO", "HOSTNAME"}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator: APCUPSdCoordinator = hass.data[DOMAIN][entry.entry_id]
+    data: APCUPSdData = coordinator.data
+    return async_redact_data(data, TO_REDACT)
diff --git a/tests/components/apcupsd/snapshots/test_diagnostics.ambr b/tests/components/apcupsd/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..a3c4d16da2f
--- /dev/null
+++ b/tests/components/apcupsd/snapshots/test_diagnostics.ambr
@@ -0,0 +1,46 @@
+# serializer version: 1
+# name: test_diagnostics
+  dict({
+    'ALARMDEL': '30 Seconds',
+    'APC': '001,038,0985',
+    'BATTDATE': '1970-01-01',
+    'BATTV': '13.7 Volts',
+    'BCHARGE': '100.0 Percent',
+    'CABLE': 'USB Cable',
+    'CUMONBATT': '8 Seconds',
+    'DATE': '1970-01-01 00:00:00 0000',
+    'DRIVER': 'USB UPS Driver',
+    'END APC': '1970-01-01 00:00:00 0000',
+    'FIRMWARE': '928.a8 .D USB FW:a8',
+    'HITRANS': '139.0 Volts',
+    'ITEMP': '34.6 C Internal',
+    'LASTSTEST': '1970-01-01 00:00:00 0000',
+    'LASTXFER': 'Automatic or explicit self test',
+    'LINEV': '124.0 Volts',
+    'LOADPCT': '14.0 Percent',
+    'LOTRANS': '92.0 Volts',
+    'MAXTIME': '0 Seconds',
+    'MBATTCHG': '5 Percent',
+    'MINTIMEL': '3 Minutes',
+    'MODEL': 'Back-UPS ES 600',
+    'NOMAPNT': '60.0 VA',
+    'NOMBATTV': '12.0 Volts',
+    'NOMINV': '120 Volts',
+    'NOMPOWER': '330 Watts',
+    'NUMXFERS': '1',
+    'OUTCURNT': '0.88 Amps',
+    'SELFTEST': 'NO',
+    'SENSE': 'Medium',
+    'SERIALNO': '**REDACTED**',
+    'STATFLAG': '0x05000008',
+    'STATUS': 'ONLINE',
+    'STESTI': '7 days',
+    'TIMELEFT': '51.0 Minutes',
+    'TONBATT': '0 Seconds',
+    'UPSMODE': 'Stand Alone',
+    'UPSNAME': 'MyUPS',
+    'VERSION': '3.14.14 (31 May 2016) unknown',
+    'XOFFBATT': '1970-01-01 00:00:00 0000',
+    'XONBATT': '1970-01-01 00:00:00 0000',
+  })
+# ---
diff --git a/tests/components/apcupsd/test_diagnostics.py b/tests/components/apcupsd/test_diagnostics.py
new file mode 100644
index 00000000000..56249a7823b
--- /dev/null
+++ b/tests/components/apcupsd/test_diagnostics.py
@@ -0,0 +1,18 @@
+"""Test APCUPSd diagnostics reporting abilities."""
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.core import HomeAssistant
+
+from tests.components.apcupsd import async_init_integration
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics."""
+    entry = await async_init_integration(hass)
+    assert await get_diagnostics_for_config_entry(hass, hass_client, entry) == snapshot