Diego Causero (born 13 January 1940) is an Italian prelate of the Catholic Church who spent his career in the diplomatic service of the Holy See.

[1] He earned a doctorate in theology in 1966, with a specialty in liturgy, at the Pontifical Atheneum of St.

[4] His assignments included stints in Nigeria, Spain, Syria, Australia, as the Holy See's representative to the United Nations in Geneva, and in Albania.

[2] On 15 December 1992, Pope John Paul II named him a titular archbishop and Apostolic Nuncio to Chad.

[7] On 10 January 2004, Pope John Paul named him Apostolic Nuncio to the Czech Republic.