[header] How to address an archbishop [title] Greet an archbishop formally by saying " your excellency. [step] " when you approach an archbishop, it's best to give them a formal salutation. Both " your excellency " and " your grace " are acceptable and highly respectful greetings. 
[substeps] For example, if you wanted to show your appreciation in person, say something like, " good morning, your grace. I'd like to thank you for your work in the catholic community.