diff --git a/homeassistant/components/meater/diagnostics.py b/homeassistant/components/meater/diagnostics.py
new file mode 100644
index 00000000000..247457d0bc8
--- /dev/null
+++ b/homeassistant/components/meater/diagnostics.py
@@ -0,0 +1,55 @@
+"""Diagnostics support for the Meater integration."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.core import HomeAssistant
+
+from . import MeaterConfigEntry
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: MeaterConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator = config_entry.runtime_data
+
+    return {
+        identifier: {
+            "id": probe.id,
+            "internal_temperature": probe.internal_temperature,
+            "ambient_temperature": probe.ambient_temperature,
+            "time_updated": probe.time_updated.isoformat(),
+            "cook": (
+                {
+                    "id": probe.cook.id,
+                    "name": probe.cook.name,
+                    "state": probe.cook.state,
+                    "target_temperature": (
+                        probe.cook.target_temperature
+                        if hasattr(probe.cook, "target_temperature")
+                        else None
+                    ),
+                    "peak_temperature": (
+                        probe.cook.peak_temperature
+                        if hasattr(probe.cook, "peak_temperature")
+                        else None
+                    ),
+                    "time_remaining": (
+                        probe.cook.time_remaining
+                        if hasattr(probe.cook, "time_remaining")
+                        else None
+                    ),
+                    "time_elapsed": (
+                        probe.cook.time_elapsed
+                        if hasattr(probe.cook, "time_elapsed")
+                        else None
+                    ),
+                }
+                if probe.cook
+                else None
+            ),
+        }
+        for identifier, probe in coordinator.data.items()
+    }
diff --git a/tests/components/meater/snapshots/test_diagnostics.ambr b/tests/components/meater/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..ced779eb114
--- /dev/null
+++ b/tests/components/meater/snapshots/test_diagnostics.ambr
@@ -0,0 +1,20 @@
+# serializer version: 1
+# name: test_entry_diagnostics
+  dict({
+    '40a72384fa80349314dfd97c84b73a5c1c9da57b59e26d67b573d618fe0d6e58': dict({
+      'ambient_temperature': 28.0,
+      'cook': dict({
+        'id': '123123',
+        'name': 'Whole chicken',
+        'peak_temperature': 27.0,
+        'state': 'Started',
+        'target_temperature': 25.0,
+        'time_elapsed': 32,
+        'time_remaining': 32,
+      }),
+      'id': '40a72384fa80349314dfd97c84b73a5c1c9da57b59e26d67b573d618fe0d6e58',
+      'internal_temperature': 26.0,
+      'time_updated': '2025-06-16T13:53:51+00:00',
+    }),
+  })
+# ---
diff --git a/tests/components/meater/test_diagnostics.py b/tests/components/meater/test_diagnostics.py
new file mode 100644
index 00000000000..9d78828a92f
--- /dev/null
+++ b/tests/components/meater/test_diagnostics.py
@@ -0,0 +1,28 @@
+"""Test Meater diagnostics."""
+
+from unittest.mock import AsyncMock
+
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.core import HomeAssistant
+
+from . import setup_integration
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_entry_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    mock_meater_client: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test config entry diagnostics."""
+    await setup_integration(hass, mock_config_entry)
+    assert (
+        await get_diagnostics_for_config_entry(hass, hass_client, mock_config_entry)
+        == snapshot
+    )