The Archbishop is the top of a diocese or archdiocese within the Catholic Church. He’s chargeable for the non secular and administrative management of his diocese or archdiocese. As an indication of respect, it is very important deal with the Archbishop in a proper and respectful method.
The right approach to deal with the Archbishop is “Your Grace.” That is adopted by his final title. For instance, if the Archbishop’s final title is Smith, you’d deal with him as “Your Grace, Archbishop Smith.”