The Curia of the Roman Church is the collection of departments and congregations which assist the Supreme Pontiff in his task of ruling the Church. The different sections of the Curia will be listed in order of their founding, with their current names.

The Secretariat of State - Originally the Office of Cardinal Nephew, this oldest department of the Curia has changed over time, though the Cardinal Secretary is still almost always the close confidant of the Pope. The Secretariat of State is the primarily responsible for the diplomatic and political activity of the Holy See, and in some circumstances the Cardinal Secretary of State can represent the person of the Supreme Pontiff himself.

The Congregation for the Doctrine of the Faith - Originally the Sacred Congregation of the Holy Office of the Roman and Universal Inquisition, this Congregation has been responsible for safeguarding the Doctrines of Holy Mother Church on Faith and Morals since its founding in 1542. For this reason everything which in any way touches on such matter falls within its competence, and it has always been one of the most important and powerful offices of the Curia.