diff --git a/homeassistant/components/huum/config_flow.py b/homeassistant/components/huum/config_flow.py
index c5cdc18107a1..d6c93e9dedb2 100644
--- a/homeassistant/components/huum/config_flow.py
+++ b/homeassistant/components/huum/config_flow.py
@@ -59,6 +59,43 @@ class HuumConfigFlow(ConfigFlow, domain=DOMAIN):
             step_id="user", data_schema=STEP_USER_DATA_SCHEMA, errors=errors
         )
 
+    async def async_step_reconfigure(
+        self, user_input: dict[str, Any] | None = None
+    ) -> ConfigFlowResult:
+        """Handle reconfiguration of the integration."""
+        errors: dict[str, str] = {}
+        reconfigure_entry = self._get_reconfigure_entry()
+
+        if user_input is not None:
+            self._async_abort_entries_match({CONF_USERNAME: user_input[CONF_USERNAME]})
+            try:
+                huum = Huum(
+                    user_input[CONF_USERNAME],
+                    user_input[CONF_PASSWORD],
+                    session=async_get_clientsession(self.hass),
+                )
+                await huum.status()
+            except Forbidden, NotAuthenticated:
+                errors["base"] = "invalid_auth"
+            except Exception:
+                _LOGGER.exception("Unknown error")
+                errors["base"] = "unknown"
+            else:
+                return self.async_update_reload_and_abort(
+                    reconfigure_entry,
+                    title=user_input[CONF_USERNAME],
+                    data_updates=user_input,
+                )
+
+        return self.async_show_form(
+            step_id="reconfigure",
+            data_schema=self.add_suggested_values_to_schema(
+                STEP_USER_DATA_SCHEMA,
+                {CONF_USERNAME: reconfigure_entry.data[CONF_USERNAME]},
+            ),
+            errors=errors,
+        )
+
     async def async_step_reauth(
         self, entry_data: Mapping[str, Any]
     ) -> ConfigFlowResult:
diff --git a/homeassistant/components/huum/quality_scale.yaml b/homeassistant/components/huum/quality_scale.yaml
index 72fc2db3428b..6422498628a0 100644
--- a/homeassistant/components/huum/quality_scale.yaml
+++ b/homeassistant/components/huum/quality_scale.yaml
@@ -64,7 +64,7 @@ rules:
   entity-translations: done
   exception-translations: done
   icon-translations: done
-  reconfiguration-flow: todo
+  reconfiguration-flow: done
   repair-issues:
     status: exempt
     comment: Integration has no repair scenarios.
diff --git a/homeassistant/components/huum/strings.json b/homeassistant/components/huum/strings.json
index 8b50fcd5eeeb..e7c597838071 100644
--- a/homeassistant/components/huum/strings.json
+++ b/homeassistant/components/huum/strings.json
@@ -2,7 +2,8 @@
   "config": {
     "abort": {
       "already_configured": "[%key:common::config_flow::abort::already_configured_device%]",
-      "reauth_successful": "[%key:common::config_flow::abort::reauth_successful%]"
+      "reauth_successful": "[%key:common::config_flow::abort::reauth_successful%]",
+      "reconfigure_successful": "[%key:common::config_flow::abort::reconfigure_successful%]"
     },
     "error": {
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
@@ -20,6 +21,16 @@
         "description": "The authentication for {username} is no longer valid. Please enter the current password.",
         "title": "[%key:common::config_flow::title::reauth%]"
       },
+      "reconfigure": {
+        "data": {
+          "password": "[%key:common::config_flow::data::password%]",
+          "username": "[%key:common::config_flow::data::username%]"
+        },
+        "data_description": {
+          "password": "[%key:component::huum::config::step::user::data_description::password%]",
+          "username": "[%key:component::huum::config::step::user::data_description::username%]"
+        }
+      },
       "user": {
         "data": {
           "password": "[%key:common::config_flow::data::password%]",
diff --git a/tests/components/huum/test_config_flow.py b/tests/components/huum/test_config_flow.py
index 511fe89636b4..1de9494ad8bd 100644
--- a/tests/components/huum/test_config_flow.py
+++ b/tests/components/huum/test_config_flow.py
@@ -183,3 +183,115 @@ async def test_reauth_errors(
     assert result["reason"] == "reauth_successful"
     assert mock_config_entry.data[CONF_USERNAME] == TEST_USERNAME
     assert mock_config_entry.data[CONF_PASSWORD] == "new_password"
+
+
+@pytest.mark.usefixtures("mock_huum_client", "mock_setup_entry")
+async def test_reconfigure_flow(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test reconfiguration flow."""
+    mock_config_entry.add_to_hass(hass)
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "reconfigure"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {
+            CONF_USERNAME: "new@sauna.org",
+            CONF_PASSWORD: "new_password",
+        },
+    )
+    await hass.async_block_till_done()
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "reconfigure_successful"
+    assert mock_config_entry.title == "new@sauna.org"
+    assert mock_config_entry.data[CONF_USERNAME] == "new@sauna.org"
+    assert mock_config_entry.data[CONF_PASSWORD] == "new_password"
+
+
+@pytest.mark.usefixtures("mock_huum_client", "mock_setup_entry")
+async def test_reconfigure_flow_already_configured(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test reconfiguration flow aborts when username already configured."""
+    mock_config_entry.add_to_hass(hass)
+
+    other_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={
+            CONF_USERNAME: "other@sauna.org",
+            CONF_PASSWORD: "other_password",
+        },
+        entry_id="OTHER_ENTRY",
+    )
+    other_entry.add_to_hass(hass)
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {
+            CONF_USERNAME: "other@sauna.org",
+            CONF_PASSWORD: "new_password",
+        },
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "already_configured"
+
+
+@pytest.mark.parametrize(
+    (
+        "raises",
+        "error_base",
+    ),
+    [
+        (Exception, "unknown"),
+        (Forbidden, "invalid_auth"),
+    ],
+)
+async def test_reconfigure_errors(
+    hass: HomeAssistant,
+    mock_huum_client: AsyncMock,
+    mock_setup_entry: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    raises: Exception,
+    error_base: str,
+) -> None:
+    """Test reconfiguration flow handles errors and recovers."""
+    mock_config_entry.add_to_hass(hass)
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    mock_huum_client.status.side_effect = raises
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {
+            CONF_USERNAME: TEST_USERNAME,
+            CONF_PASSWORD: "wrong_password",
+        },
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["errors"] == {"base": error_base}
+
+    # Recover with valid credentials
+    mock_huum_client.status.side_effect = None
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {
+            CONF_USERNAME: TEST_USERNAME,
+            CONF_PASSWORD: "new_password",
+        },
+    )
+    await hass.async_block_till_done()
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "reconfigure_successful"
+    assert mock_config_entry.data[CONF_USERNAME] == TEST_USERNAME
+    assert mock_config_entry.data[CONF_PASSWORD] == "new_password"