diff --git a/homeassistant/components/fastdotcom/__init__.py b/homeassistant/components/fastdotcom/__init__.py
index 9cd99c0c58b..12bd355b82b 100644
--- a/homeassistant/components/fastdotcom/__init__.py
+++ b/homeassistant/components/fastdotcom/__init__.py
@@ -14,7 +14,7 @@ from homeassistant.helpers.start import async_at_started
 from homeassistant.helpers.typing import ConfigType
 
 from .const import CONF_MANUAL, DEFAULT_INTERVAL, DOMAIN, PLATFORMS
-from .coordinator import FastdotcomDataUpdateCoordindator
+from .coordinator import FastdotcomDataUpdateCoordinator
 from .services import async_setup_services
 
 _LOGGER = logging.getLogger(__name__)
@@ -50,7 +50,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
 
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Set up Fast.com from a config entry."""
-    coordinator = FastdotcomDataUpdateCoordindator(hass)
+    coordinator = FastdotcomDataUpdateCoordinator(hass)
     hass.data.setdefault(DOMAIN, {})[entry.entry_id] = coordinator
 
     await hass.config_entries.async_forward_entry_setups(
diff --git a/homeassistant/components/fastdotcom/coordinator.py b/homeassistant/components/fastdotcom/coordinator.py
index 42e60069507..75ac55b8314 100644
--- a/homeassistant/components/fastdotcom/coordinator.py
+++ b/homeassistant/components/fastdotcom/coordinator.py
@@ -12,7 +12,7 @@ from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, Upda
 from .const import DEFAULT_INTERVAL, DOMAIN, LOGGER
 
 
-class FastdotcomDataUpdateCoordindator(DataUpdateCoordinator[float]):
+class FastdotcomDataUpdateCoordinator(DataUpdateCoordinator[float]):
     """Class to manage fetching Fast.com data API."""
 
     def __init__(self, hass: HomeAssistant) -> None:
diff --git a/homeassistant/components/fastdotcom/diagnostics.py b/homeassistant/components/fastdotcom/diagnostics.py
new file mode 100644
index 00000000000..d7383ef0c6a
--- /dev/null
+++ b/homeassistant/components/fastdotcom/diagnostics.py
@@ -0,0 +1,24 @@
+"""Diagnostics support for Fast.com."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .coordinator import FastdotcomDataUpdateCoordinator
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for the config entry."""
+    coordinator: FastdotcomDataUpdateCoordinator = hass.data[DOMAIN][
+        config_entry.entry_id
+    ]
+
+    return {
+        "coordinator_data": coordinator.data,
+    }
diff --git a/homeassistant/components/fastdotcom/sensor.py b/homeassistant/components/fastdotcom/sensor.py
index 52f9c6f0a2c..721290e8c0d 100644
--- a/homeassistant/components/fastdotcom/sensor.py
+++ b/homeassistant/components/fastdotcom/sensor.py
@@ -15,7 +15,7 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
 from .const import DOMAIN
-from .coordinator import FastdotcomDataUpdateCoordindator
+from .coordinator import FastdotcomDataUpdateCoordinator
 
 
 async def async_setup_entry(
@@ -24,13 +24,11 @@ async def async_setup_entry(
     async_add_entities: AddEntitiesCallback,
 ) -> None:
     """Set up the Fast.com sensor."""
-    coordinator: FastdotcomDataUpdateCoordindator = hass.data[DOMAIN][entry.entry_id]
+    coordinator: FastdotcomDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
     async_add_entities([SpeedtestSensor(entry.entry_id, coordinator)])
 
 
-class SpeedtestSensor(
-    CoordinatorEntity[FastdotcomDataUpdateCoordindator], SensorEntity
-):
+class SpeedtestSensor(CoordinatorEntity[FastdotcomDataUpdateCoordinator], SensorEntity):
     """Implementation of a Fast.com sensor."""
 
     _attr_translation_key = "download"
@@ -41,7 +39,7 @@ class SpeedtestSensor(
     _attr_has_entity_name = True
 
     def __init__(
-        self, entry_id: str, coordinator: FastdotcomDataUpdateCoordindator
+        self, entry_id: str, coordinator: FastdotcomDataUpdateCoordinator
     ) -> None:
         """Initialize the sensor."""
         super().__init__(coordinator)
diff --git a/homeassistant/components/fastdotcom/services.py b/homeassistant/components/fastdotcom/services.py
index a901915e11f..5939a667342 100644
--- a/homeassistant/components/fastdotcom/services.py
+++ b/homeassistant/components/fastdotcom/services.py
@@ -8,14 +8,14 @@ from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers import issue_registry as ir
 
 from .const import DOMAIN, SERVICE_NAME
-from .coordinator import FastdotcomDataUpdateCoordindator
+from .coordinator import FastdotcomDataUpdateCoordinator
 
 
 def async_setup_services(hass: HomeAssistant) -> None:
     """Set up the service for the Fastdotcom integration."""
 
     @callback
-    def collect_coordinator() -> FastdotcomDataUpdateCoordindator:
+    def collect_coordinator() -> FastdotcomDataUpdateCoordinator:
         """Collect the coordinator Fastdotcom."""
         config_entries = hass.config_entries.async_entries(DOMAIN)
         if not config_entries:
@@ -24,7 +24,7 @@ def async_setup_services(hass: HomeAssistant) -> None:
         for config_entry in config_entries:
             if config_entry.state != ConfigEntryState.LOADED:
                 raise HomeAssistantError(f"{config_entry.title} is not loaded")
-            coordinator: FastdotcomDataUpdateCoordindator = hass.data[DOMAIN][
+            coordinator: FastdotcomDataUpdateCoordinator = hass.data[DOMAIN][
                 config_entry.entry_id
             ]
             break
diff --git a/tests/components/fastdotcom/snapshots/test_diagnostics.ambr b/tests/components/fastdotcom/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..d2b4ca6c55a
--- /dev/null
+++ b/tests/components/fastdotcom/snapshots/test_diagnostics.ambr
@@ -0,0 +1,6 @@
+# serializer version: 1
+# name: test_get_config_entry_diagnostics
+  dict({
+    'coordinator_data': 50.3,
+  })
+# ---
diff --git a/tests/components/fastdotcom/test_diagnostics.py b/tests/components/fastdotcom/test_diagnostics.py
new file mode 100644
index 00000000000..7ea644665c7
--- /dev/null
+++ b/tests/components/fastdotcom/test_diagnostics.py
@@ -0,0 +1,43 @@
+"""Test the Fast.com component diagnostics."""
+
+from unittest.mock import patch
+
+from syrupy import SnapshotAssertion
+
+from homeassistant.components.fastdotcom.const import DEFAULT_NAME, DOMAIN
+from homeassistant.config_entries import SOURCE_USER
+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,
+    hass_client: ClientSessionGenerator,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test if get_config_entry_diagnostics returns the correct data."""
+    config_entry = MockConfigEntry(
+        version=1,
+        domain=DOMAIN,
+        title=DEFAULT_NAME,
+        source=SOURCE_USER,
+        options={},
+        entry_id="TEST_ENTRY_ID",
+        unique_id="UNIQUE_TEST_ID",
+        minor_version=1,
+    )
+    config_entry.add_to_hass(hass)
+
+    with patch(
+        "homeassistant.components.fastdotcom.coordinator.fast_com", return_value=50.3
+    ):
+        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)
+        == snapshot
+    )