Eugen Gustav Dücker was a romanticist Baltic German painter.

He lived and developed almost all his career in Düsseldorf. He is associated with the Düsseldorf school of painting. A notable student of his was the Norwegian landscape painter Adelsteen Normann who studied with Dücker from 1869 to 1872. Other pupils included Heinrich Hermanns, Franz Korwan, Georg Macco, Otto Modersohn, Fritz Overbeck, Edgar Meyer, Heinrich Petersen-Angeln, Oskar Hoffmann and Carl Wuttke. 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.

Perhaps his best known painting is Coastal landscape (Fishermen going home).