Francesco Marmaggi (31 August 1876 – 3 November 1949) was a Cardinal of the Roman Catholic Church who served as Prefect of the Congregation of the Council and, earlier, as Nuncio in Romania, Czechoslovakia and Poland, as well as being a special envoy to Turkey.

Marmaggi was named extraordinary envoy to Turkey after the Greco-Turkish War, part of Pope Pius XI's decision to upgrade the papacy's diplomatic relations, which had outlined in the encyclical Pacem, Dei Munus Pulcherrimum, breaking with the tradition of ceding to Franch the role of protector for Middle Eastern Catholics.

[3][4][5] Marmaggi left Prague on 6 July 1925, after repeatedly warning President Tomáš Masaryk, Premier Antonín Švehla and Foreign Minister Edvard Beneš not to attend the ceremonies.

Two years later, alongside Cardinals Maglione, Pietro Boetto, Nicola Canali, Mario Nasalli Rocca di Corneliano, Alberto di Jorio, Giovanni Mercati, Raffaele Rossi, Carlo Salotti, Federico Tedeschini and Eugène-Gabriel-Gervais-Laurent Tisserant, he sat on a papal commission analyzing the situation created by the Spanish Civil War and its implications for Roman Catholic clergy in Spain.

Reportedly, he wanted his successor in Poland to be Angelo Giuseppe Roncalli, the Nuncio to Turkey and Greece and future Pope John XXIII.