Ambrogio Marchioni (31 August 1911 – 2 May 1995) was an Italian prelate of the Catholic Church who worked in the diplomatic service of the Holy See.
He was made an archbishop in 1961 and served as Apostolic Nuncio to several countries from 1959 to 1984, including Switzerland for seventeen years.
[3] He was secretary there on 15 October 1943 when Defence Minister Rodolfo Graziani asked him to support or express sympathy for the Italian Social Republic, the puppet state the Nazis had established.
Marchioni responded by reiterating the neutrality of the Church and the Holy See and the need rather to "instill calm, tranquility, order, so as to ensure that ill-advised actions do not produce serious reprisals against so many innocent people or the entire population".
[5] He was named titular archbishop of Severiana on 14 October 1961[6] and received his episcopal consecration on 12 November 1961 from Cardinal Carlo Confalonieri.