How to Address an Archbishop
Addressing an acrhbishop the right way will show your respect. In person, address them as either “Your Excellency” or “Your Grace.” If the archbishop is also a cardinal, address them as "Your Eminence" instead. If you already know the archbishop, you can use their surname, such as “Archbishop Anderson.” When you're writing a letter to an archbishop, you should address the envelope and the top of the letter using their full title. On the first line, write “His excellency.” On the second line, write, “The Most Reverend,” followed by their full name. Then, on the third line, write, “Archbishop of,” followed by their province. Open your letter with “Your excellency” instead of “Dear.”
Greet an archbishop formally by saying “Your Excellency. ” 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. 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. I'm very grateful for your kindness and leadership.” Greet an archbishop informally by saying “Archbishop (surname). ” If you've spoken to a particular archbishop before, have volunteered under them, or are related to them, it may be appropriate to greet them informally. Refer to the archbishop as “Archbishop (surname).” For example, you might say, “Hello, Archbishop Anderson. It's great to see you.” Say the archbishop’s title and surname when you ask how they are. Whether you greet an archbishop formally or informally, you should always include their title and surname when you ask them questions or call out to them. For example, it wouldn't be appropriate to say, “Hello, archbishop. How have you been?” Instead, say something like, “Hello, Archbishop Smith. How have you been?” Say “Your Eminence,” to a cardinal who is also an archbishop. Some cardinals are also archbishops. If you want to greet a cardinal who is also an archbishop in person, it's best to say “Your Eminence,” or “Your Lordship,” in order to show respect. Write a heading at the top of the letter. At the top of the page, write “His Excellency,” and then start a new line directly underneath. On the second line, write, “The Most Reverend (full name). Write a third line that says, “Archbishop of (diocese).” If you're writing to a cardinal who is also an archbishop, instead write "His Eminence, (first name) Cardinal (surname), Archbishop of (diocese)" as the heading. Include a salutation underneath the heading. Skip a couple of lines and write a salutation before starting the body of the letter. Write “Your Excellency,” if the letter is of a formal nature and write “Dear Archbishop (surname),” if it's a little more informal. When writing a letter to a cardinal who is also an archbishop, write "Your Eminence," "Most Eminent Cardinal," or "My Lord Cardinal," as the salutation. Write “Respectfully Yours in Christ,” at the end. After you've finished writing the body of the letter, skip a few lines before concluding the letter. It's most common to write “Respectfully Yours in Christ,” and then start a new line below it where you sign your full name. However, you could also conclude the letter by writing, “Asking Your Excellency's blessing, I am, Yours respectfully in Christ,” just above your full name. Address the envelope. Put the letter in the envelope and seal it. Then you'll write four different things centered on the envelope before you send the letter. First, write “The Most Reverend.” Start a new line underneath this one that says only the archbishop's full name. Below that, write “Archbishop of (diocese).” Start the address on the 4th line and make sure to include the street, city, state, and zip code. 
Greet an archbishop formally by saying “Your Excellency. Greet an archbishop informally by saying “Archbishop (surname). Say the archbishop’s title and surname when you ask how they are. Say “Your Eminence,” to a cardinal who is also an archbishop. Write a heading at the top of the letter. Include a salutation underneath the heading. Write “Respectfully Yours in Christ,” at the end. Address the envelope. 