Actes et documents du Saint Siège relatifs à la Seconde Guerre Mondiale

Actes et Documents du Saint Siège relatifs à la Seconde Guerre Mondiale (French for Acts and Documents of the Holy See related to the Second World War), often abbreviated Actes or ADSS, is an eleven-volume collection of documents from the Vatican historical archives, related to the papacy of Pope Pius XII during World War II.

The collection was compiled by four Jesuit priest-historians—Pierre Blet (France), Angelo Martini (Italy), Burkhart Schneider (Germany), and Robert A. Graham (United States)—authorized by Pope Paul VI in 1964, and published between 1965 and 1981.

The remainder of the documents from Pius XII's papacy may not be released for years; Bishop Sergio Pagano, the prefect of the Vatican Secret Archives announced in June 2009 that five or six years additional of preparation would be necessary to organize the papers, after which the decision to make further documents available to researchers will be the pope's. The completed catalog would include approximately 16 million documents from Pius XII's papacy (1939-1958), divided into approximately 700 boxes related to the Cardinal Secretary of State and the various nunciatures.

The collection is a rare exception to the Vatican's de facto seventy-five year rule for opening its archives, published in the aftermath of the controversial play, The Deputy, by Rolf Hochhuth. The collection was intended to answer critics of Pius XII, such as Hochhuth, who alleged that the Pope had turned a blind eye to Nazi atrocities against Jews. In particular, the editors presented a variety of documents which they claim demonstrate how Pope Pius XII protested the persecution of and various deportations of Jews.

Five of the eleven volumes deal with World War II, in chronological order. Four volumes deal with the humanitarian activities of the Holy See during the war, also in chronological order. One covers Pope Pius XII's letters to German bishops before and during the war. The last encompasses documents pertaining to Poland and Baltic countries.

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