The Ecclesiastical Office of the Apostolic Overseer comprises the Office of the Apostolic Overseer and the Apostolic Secretariat that support the work of the Apostolic Overseer and the Apostolic Branch.

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The offices and ecclesiastical departments of the Ecclesiastical Office of the Apostolic Overseer are:

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• The Office of the Apostolic Overseer

• The Office of the Guardians of the Apostolic See

• The Apostolic Secretariat for Church Governance

• The Apostolic Secretariat of Ecumenical Relations

• The Apostolic Secretariat of Interreligious and Secular Affairs

• The Apostolic Secretariat for the Apostolic Area of Temple Place

• The Apostolic Secretariat of Religious and Secular Education

• The Apostolic Secretariat of the Apostolic See

• The Apostolic Secretariat of the Apostolic Coventry

• The Apostolic Secretariat of the Ecumenical Council

• The Apostolic Secretariat of the Ex-Officio President

• The Apostolic Secretariat of the Apostolic Branch Treasury

• The Apostolic Secretariat of the Apostolic Realm

• The Apostolic Secretariat of Apostolic Branch Communications