Monsignor is a form of address or title for certain members of the clergy in the Catholic Church. Monsignor is the apocopic form of the Italian monsignore, meaning "my lord". "Monsignor" can be abbreviated as Mons. or Msgr. In some countries, the title "monsignor" is used as a form of address for bishops. However, in English-speaking countries, the title is unrelated to the episcopacy, though many priests with the title later become bishops.

The Secretariat of State is the oldest dicastery in the Roman Curia, the central papal governing bureaucracy of the Catholic Church. It is headed by the Cardinal Secretary of State and performs all the political and diplomatic functions of the Holy See. The Secretariat is divided into three sections: the Section for General Affairs, the Section for Relations with States, and, since 2017, the Section for Diplomatic Staff.