Othon Henri del Caretto or Del Carretto, Marquis of Grana (1629 – Mariemont, Hainaut 15 June 1685) was an Imperial Army commander and political figure.
Descendant from an old Italian noble Del Carretto family, he was the son of Don Francesco del Carretto, Marquis of Grana, Count of Millesimo (1590-1652) and his wife, Margarethe Fugger zu Nordendorff und Wörth (1592-1652). He was also titular Margrave of Savona, Marquis of Grana, Count of Millesimo, etc.
He became instantly famous on 11 August 1675 in the Battle of Konzer Brucke, he engaged the right flank on exactly the right moment against the French under François de Créquy, inflicting a severe defeat. On the battlefield a Grana-memorial was erected in 1892. He became a Knight of the Golden Fleece in 1678, Field Marshal of the Empire, Imperial ambassador in Madrid and General Captain and Governor of the Spanish Netherlands in April 1682.
On 31 July 1667 he married Countess Maria Theresia von Herberstein (Graz 1641 – Brussels 1682), widow of Count Franz Adam von Losenstein (1631-1666). Together, they had two daughters:
After the death of his first wife Othon Henri married, on 10 June 1683, Princess Maria Theresa von Arenberg (1666–1716), sister of his son-in-law.