Diego Causero

Diego Causero (13 January 1940 – 14 November 2025) was an Italian prelate of the Catholic Church who spent his career in the diplomatic service of the Holy See. From 1992 to 2015, he served as the head of the Vatican's diplomatic mission in several African and European countries.

Diego Causero was born in Moimacco in the Province of Udine, Italy, on 13 January 1940. He studied at the seminary in Udine, he continued his studies at the Pontifical Gregorian University from 1959 to 1964 and was ordained a priest of the Archdiocese of Udine on 7 April 1963.

He earned a doctorate in theology in 1966, with a speciality in liturgy, at the Pontifical Atheneum of St. Anselm.

To prepare for a career as a diplomat he entered the Pontifical Ecclesiastical Academy in 1969. He entered the diplomatic service of the Holy See in 1973. His assignments included stints in Nigeria, Spain, Syria, Australia, as the Holy See's representative to the United Nations in Geneva, and in Albania.

On 15 December 1992, Pope John Paul II named him a titular archbishop and Apostolic Nuncio to Chad. He received his episcopal consecration on 6 January 1993 from Pope John Paul. On 1 February 1993, he was named Apostolic Nuncio to the Central African Republic and the Republic of the Congo as well.

On 31 March 1999, Pope John Paul II appointed him Apostolic Nuncio to Syria.

On 10 January 2004, John Paul II named him Apostolic Nuncio to the Czech Republic.

On 28 May 2011, Pope Benedict XVI appointed him Apostolic Nuncio to Switzerland and Liechtenstein.

He retired on 5 September 2015 upon the appointment of Thomas Gullickson as his successor in Switzerland and Liechtenstein.

Causero died on 14 November 2025, at the age of 85.