Ecclesiastical addresses are the formal styles of address used for members of the clergy.
The major difference between U.S. practice and that in several other English-speaking countries is the form of address for archbishops and bishops. In Britain and countries whose Roman Catholic usage it directly influenced:
In Ireland, and in other countries whose Roman Catholic usage it influenced, all bishops, not archbishops alone, are titled the Most Reverend (Most Rev.).
Clergy are often referred to with the title Doctor (Dr.), or have D.D. (Doctor of Divinity) placed after their name, where justified by their possession of such degree.
Similar to, and the source of, most of the U.S. English titles, with some variation:
In the predominantly Catholic Philippines, ecclesiastical address is adapted from American usage. The titles listed below are only used in the most formal occasions by media or official correspondences, save for the simpler forms of address. Post-nominals that indicate educational attainment or membership in a religious order are usually included.
Although the styles and titles of Eastern Catholic clergy varies from language to language, in the Greek and Arabic-speaking world the following would be acceptable, but is by no means a full list of appropriate titles. It is notable that surnames are never used except in extra-ecclesial matters or to specify a particular person where many share one Christian name or ordination name. Where not noted, Western titles may be supposed. The following are common in Greek Melkite Catholic usage and in Greek Orthodox usage in the United States.
Bishop / Archbishop: In Arabic, a bishop is styled "Sayedna," while in Syriac-tradition churches, he is styled "Mar". If an Eastern Catholic Archbishop or Patriarch is made a Cardinal by the Pope, he may be addressed as "His Eminence" or use the hybrid title "His Beatitude and Eminence".
Priest: In Arabic, "Abouna", and in Greek "Pappas".
Deacon: Identical to a priest in all ways except "Father Deacon" is also heard ("Abouna Shammas" or "Pappas Diakonos").
Subdeacon: Reverend Subdeacon in written address, but the Christian name with or without "Brother" is usually used, except some traditions where "Father Subdeacon" is used. In Arabic, this is confused by the word "Shammas" being used for both the subdeaconate and the deaconate, the distinction being a "Deacon of the Letter" and a "Deacon of the Gospel," respectively. Often a Deacon will be addressed as "Father" and the subdeacon as "Brother" to make the distinction clear.