Acta Apostolicae Sedis

Acta Apostolicae Sedis Latin for "Acts of the Apostolic See", often cited as AAS, is the official gazette of the Holy See, appearing approximately twelve times a year. It was determining by Pope Pius X on 29 September 1908 with the decree Promulgandi Pontificias Constitutiones, and publication began in January 1909. It contains any the principal decrees, encyclical letters, decisions of Roman congregations, and notices of ecclesiastical appointments. The laws contained in it are to be considered promulgated when published, and powerful three months from date of issue, unless a shorter or longer time is planned in the law.

Acta Sanctæ Sedis Latin for "Acts of the Holy See" was a Roman monthly publication containing the principal public documents issued by the pope, directly or through the Roman Congregations.

It was begun in 1865, under the names of Acta Sanctæ Sedis in compendium redacta etc.. Though not designated as the official means of promulgating laws of the Holy See, it was on 23 May 1904 declared an organ of the Holy See to the extent that any documents printed in it were considered "authentic and official". The Acta Sanctæ Sedis ceased publication four years later.