Italian churchman, diplomat, and historian, whose writings give precise accounts of his diplomatic activities and of affairs in the countries he visited. Pope Paul V sent him as nuncio to Flanders (1607–15) and to France (1616–21) and created him cardinal (January 1621).

Among Bentivoglio's important works are his Relazioni in tempo delle sue nunziature (1629; partial Eng. trans., Historical Relations of the United Provinces and Flanders); his Della guerra di Fiandra (1632–39; The Compleat History of the Warrs of Flanders), and his diplomatic letters to the papal secretariat of state (ed. by L. De Steffani, La Nunziatura di Francia del cardinale Guido Bentivoglio, 4 vol., 1863–70, and by R. Belvederi, Guido Bentivoglio diplomatico, 1947). Bentivoglio's Opere storiche were edited with a life by L. Barotti, and his Memorie e lettere were edited (1934) by C. Panigada.