Heinrich Joseph Karl Ludwig Ritter und Edler von Poschinger (31 August 1845, Munich, Germany - 10 August 1911, La Bollène, France) was a German writer and historian.
In 1883 he married Margarethe (2 May 1861, Breslau - 1911, La Bollène), daughter of Jakob von Landau, a freiherr and member of the Privy Council of Commerce - she converted to Catholicism in 1883.
In 1876 he moved to the Reich Chancellery in Berlin and worked there until 1900, meeting Otto von Bismarck - he became known for publishing Bismarck's political files, letters and talks and writing papers on him as a diarist, economist, parliamentarian, federal councillor and diarist.
He also dealt with the estate of president Otto Theodor von Manteuffel.
After Bismarck's death, Poschinger left government service and returns to Nice, where he founded a German-language daily newspaper entitled Riviera-Tageblatt.