Abraham Constantine Mouradgea d'Ohsson (26 November 1779, in Constantinople – 25 December 1851, in Berlin), was a Swedish historian and diplomat of Armenian descent.

He was a legation secretary in Madrid in 1805–06, at the embassy of the Prussian royal court in 1807–08, in Seville (where the Spanish insurrectionary government had its headquarters) in part of 1809, and in Paris, where he served as charge d'affaires from 1811 to 1813.

Later he served a term as Cabinet Secretary to Crown Prince Karl Johan, was appointed in 1816 to the Swedish Minister at The Hague, was moved in the same capacity to Berlin in 1834 and recalled from there in 1850.

[2] He studied chemistry and mineralogy under by Berzelius, and authored several essays for the Academy of Sciences as well as documents on universal gravitation (La pression de l'air et les theorem d'hydrodynamique, 1852).

He published in 1820 the third part of his father's work, "Tableau Général de l'Empire othoman" and wrote "Des Peuple you Caucase ou Voyage d'Abou-l-Cassim" (1828) and "Histoire des Mongols depuis Tchinguis-Khan jusqu'à Timour" (1834–35; new edition 1852), a widely referenced work.