August Heinrich Hermann von Dönhoff (10 October 1797 in Potsdam – 1 April 1874 at Friedrichstein Palace (East Prussia)) was a Prussian diplomat.
Dönhoff participated as a volunteer in the campaign of 1815, studied in Königsberg, Göttingen and Heidelberg in 1816-1819 and then travelled to Italy.
He began his diplomatic career in 1821 at the Prussian Foreign Ministry in Berlin, was then employed in the embassies in Paris in 1823, in Madrid in 1825, and in London in 1828, where he played a significant role in the conference on Belgium.
In May 1848 he resigned, but was made Foreign Minister of Prussia in September 1848 in the government of Ernst von Pfuel, a position he only held for a short time however.
He was once again elected a member of the Prussian first chamber in the summer of 1850, and joined the moderate right-wing Partei Jordan.