Baron Giacomo de Martino (7 September 1868 – 25 June 1957) was an Italian diplomat and politician.

[2][3] Born in Bern, Switzerland to the nobleman Renato de Martino (brother of Giacomo, governor of the colonies) and the Swiss Elisabetta de Wirsen, Giacomo de Martino completed his early studies in the Swiss Confederation before moving to Italy, to Florence, where he graduated in social sciences at the Istituto Cesare Alfieri.

Having embarked on a diplomatic career, de Martino became Head of Cabinet at the Ministry of Foreign Affairs at a very young age (October 1911 – January 1913) and then Secretary General (from 1913 to 1919), although technically he held the rank of Minister Plenipotentiary 1st Class.

On January 23, 1927, De Martino traveled to Chicago, and spent several days touring the city addressing the Italian community and explaining Fascism.

With the advent of the Republic, de Martino retired from public life and died in Rome, Italy on 25 June 1957.