diff --git a/homeassistant/components/telegram_bot/diagnostics.py b/homeassistant/components/telegram_bot/diagnostics.py
new file mode 100644
index 00000000000..0cf2fb76bcc
--- /dev/null
+++ b/homeassistant/components/telegram_bot/diagnostics.py
@@ -0,0 +1,33 @@
+"""Diagnostics platform for Telegram bot integration."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from yarl import URL
+
+from homeassistant.components.diagnostics import REDACTED, async_redact_data
+from homeassistant.const import CONF_API_KEY, CONF_URL
+from homeassistant.core import HomeAssistant
+
+from . import TelegramBotConfigEntry
+from .const import CONF_CHAT_ID
+
+TO_REDACT = [CONF_API_KEY, CONF_CHAT_ID]
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: TelegramBotConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+
+    data = async_redact_data(config_entry.data, TO_REDACT)
+    if config_entry.data.get(CONF_URL):
+        url = URL(config_entry.data[CONF_URL])
+        data[CONF_URL] = url.with_host(REDACTED).human_repr()
+
+    return {
+        "data": data,
+        "options": async_redact_data(config_entry.options, TO_REDACT),
+        "subentries_count": len(config_entry.subentries.values()),
+    }
diff --git a/homeassistant/components/telegram_bot/quality_scale.yaml b/homeassistant/components/telegram_bot/quality_scale.yaml
index 495da7d0e80..cdd14554937 100644
--- a/homeassistant/components/telegram_bot/quality_scale.yaml
+++ b/homeassistant/components/telegram_bot/quality_scale.yaml
@@ -45,7 +45,7 @@ rules:
 
   # Gold
   devices: todo
-  diagnostics: todo
+  diagnostics: done
   discovery-update-info: todo
   discovery: todo
   docs-data-update: todo
diff --git a/tests/components/telegram_bot/snapshots/test_diagnostics.ambr b/tests/components/telegram_bot/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..b5be94f1c7a
--- /dev/null
+++ b/tests/components/telegram_bot/snapshots/test_diagnostics.ambr
@@ -0,0 +1,18 @@
+# serializer version: 1
+# name: test_diagnostics
+  dict({
+    'data': dict({
+      'api_key': '**REDACTED**',
+      'platform': 'webhooks',
+      'proxy_url': None,
+      'trusted_networks': list([
+        '127.0.0.1/32',
+      ]),
+      'url': 'https://**redacted**/',
+    }),
+    'options': dict({
+      'parse_mode': 'markdown',
+    }),
+    'subentries_count': 2,
+  })
+# ---
diff --git a/tests/components/telegram_bot/test_diagnostics.py b/tests/components/telegram_bot/test_diagnostics.py
new file mode 100644
index 00000000000..e0b782c955a
--- /dev/null
+++ b/tests/components/telegram_bot/test_diagnostics.py
@@ -0,0 +1,27 @@
+"""Tests for Telegram bot diagnostics."""
+
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.components.telegram_bot.const import DOMAIN
+from homeassistant.core import HomeAssistant
+
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    webhook_platform,
+    mock_external_calls: None,
+    mock_generate_secret_token,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics."""
+
+    config_entry = hass.config_entries.async_entries(DOMAIN)[0]
+
+    diagnostics = await get_diagnostics_for_config_entry(
+        hass, hass_client, config_entry
+    )
+    assert diagnostics == snapshot