Enrico Cialdini, Duca di Gaeta (10 August 1811 – 8 September 1892) was an Italian soldier, politician and diplomat.

Between 1862 and 1866 he held the position of lieutenant-royal at Naples where he fought against the Brigandage in the Two Sicilies[citation needed], and in 1864 was created senator.

[2] On the outbreak of the Third Italian War of Independence he resumed command of an army corps, but dissensions between him and Alfonso La Marmora prejudiced the issue of the campaign and contributed to the defeat of Custoza.

[2] On 3 August 1870 he pleaded in favour of Italian intervention in aid of France, a circumstance which enhanced his influence when in July 1876 he replaced Costantino Nigra as ambassador to the French Republic.

[2] This position he held until 1882, when he resigned on account of the publication by Pasquale Stanislao Mancini of a despatch in which he had complained of arrogant treatment by William Henry Waddington.