Acta Œcumenica is the journal of the Dicastery for Promoting Christian Unity. Founded in 2020, on the occasion of the 25th anniversary of the Encyclical Ut unum sint as well as the 60th anniversary of the establishment of the Dicastery, it follows on from Information Service/Service d'information which had been published by the Dicastery since 1967, the archives of which are available online here below. 

Acta Œcumenica is an annual volume that gathers documents on the engagement of the Holy See with regard to Christian unity: the ecumenical events and declarations of the Holy Father, information on the various activities of the Dicastery (documentation on the different international dialogues, texts of the Week of Prayer for Christian Unity, etc.), as well as the Commission for Religious Relations with the Jews.

Complementing the Dicastery's website, which offers immediate updates on ecumenical news from the Holy See, Acta Œcumenica is a complete reference source on the official ecumenical documents of the Holy See, generally published in their original language, for academic and research purposes.