How to Address Priests and Religious
Deacon
Direct address: Deacon Morris
Written address: Reverend Deacon Michael Morris
Formal introduction: The Reverend Deacon Michael Morris
Brother
Direct address: Brother Elias.
Written address: Brother Elias, O.F.M.
Formal introduction: Brother Elias of the Order of Friars Minor.
Religious Priest
Direct address: Father McKenzie, or Father.
Written address: The Reverend Father Leo F. McKenzie, S.J.
Formal introduction: The Reverend Father Leo McKenzie of The Society of Jesus.
Diocesan Priest
Direct address: Father Butler, or Father.
Written address: The Reverend Father John W. Butler.
Formal introduction: The Reverend Father John Butler.
Vicars, canons, provincials, deans and rectors
Direct address: Reverend Smith or Father Smith
Written address: The Very Reverend Father Provincial Thomas R. Smith
(ab. The Very Rev.) Formal introduction: The Very Reverend Vicar General James Dean Protocol: the same as for Priests.
Monsignor
Direct address: Monsignor Smith, or Monsignor.
Written address: The Reverend Monsignor Thomas R. Smith, or The Reverend Monsignor Thomas R. Smith.
Formal introduction: The Reverend Monsignor Thomas Smith.Protocol: the same as for Priests.
Bishop
Direct address: Your Excellency, or Bishop McNeil.
Written address: His Excellency, The Right Reverend William A. Scully, D.D. Bishop of Baltimore. or His Excellency, The Right Reverend Bishop William Scully of Baltimore.
Formal closing: Kissing the Sacred Ring,
Formal introduction: His Excellency, the Bishop of Baltimore.
Archbishop
Direct address: Your Grace, or Archbishop Kovak.
Written address: His Grace, The Most Reverend Michael T. Kovak, S.T.D. Archbishop of New York, or His Grace, The Most Reverend Archbishop Michael T. Kovak, of New York.
Formal closing: Kissing the Sacred Ring,
Formal introduction: His Grace, the Archbishop of Baltimore.
Protocol: The same as for a Bishop.
Patriarch
Direct address: Your Beatitude.
* Note: the Patriarch of Lisbon is addressed as “Your Eminence”
Written address: His Beatitude, the Most Reverend Michael Cardinal Sabbah, Patriarch of Jerusalem.
Formal introduction: His Beatitude, The Patriarch of Jerusalem.
Protocol: The same as for a Bishop.
Cardinal
Direct address: Your Eminence, or Cardinal Hand.
Written address: His Eminence, Thomas Cardinal Hand, Archbishop of Los Angeles, or, His Eminence, The Most Reverend Cardinal Thomas J. Hand, of Los Angeles.
Formal closing: Kissing the Sacred Purple,
Formal introduction: His Eminence, Cardinal of Los Angeles.
Protocol: The same as for a Bishop.
Pope
Direct address: Your Holiness, or Holy Father.
Written address: His Holiness, Pope Pius XII, or better, The Sovereign Pontiff, His Holiness Pius XII.
Formal closing: Kissing the Sacred Foot,
Formal introduction: His Holiness, the Pope.
Abbreviations should follow this form:
Brother – Bro., or Br.;
Abbot – Ab.;
Father – Fr., or F. (plural – FF.);
Reverend Father – R.P. (Reverendus pater), or more often, Rev. Fr.;
Right Reverend, Most Reverend – RR. (Reverendissimus)
Monsignor – Msgr. or Mgr.;
Bishop – Ep., Epus. (Episcopus);
Archbishop – Archieps. (Archiepiscopus), or Arch.;
His Eminence – H.E.;
Eminence – Emus. (Eminentissimus)
His Holiness – H.H.
Source: https://www.traditioninaction.org/religious/d003rpHowToAddressClergy.html : Marian Therese Horvat, Ph.D.