29 January] 1841 – 6 December 1916) was a Baltic German painter, in the Romantic style, associated with the Düsseldorfer Malerschule.

He was born to Eduard Dücker (1813–1886), a master carpenter, and his wife, Amalie née Fischer (1810–1880).

He made lengthy stops in Munich and Karlsruhe, where he took lessons from Karl Friedrich Lessing.

His well known pupils at the Akademie included Heinrich Hermanns, Franz Korwan, Georg Macco, Otto Modersohn, Fritz Overbeck, Edgar Meyer, Heinrich Petersen-Angeln, Oskar Hoffmann and Carl Wuttke.

[2] Despite his career's roots in Germany, he spent much of his time in Estonia, where he painted idyllic landscapes of the sea and the countryside.