How to run commerce_order_save() without triggering any rules? I need to run commerce_order_save() on several Orders in loop but without triggering any Rules.

Is that possible ?
It's possible, but the change would need to be sitewide (not just in the context of rules). You'd need to override the entity controller class used for commerce_product (which you could do with hook_entity_info_alter()), and re-implement its save() method so it doesn't invoke the entity hooks.

If that is undesirable (probably is), and you just need to update field values, you can use field_attach_update() instead, which will bypass the entity save process altogether:

$order-&gt;some_field[LANGUAGE_NONE][0]['value'] = 'foo';
field_attach_update('commerce_order', $order);


Other than those I don't think there's any way to accomplish it using the API.