Wolf Jürgen Baron von Engelhardt (9 February 1910, Tartu – 4 December 2008, Tübingen) was a German geologist and mineralogist.
In the years 1929-1935, he began the study of natural sciences, in particular geology, mineralogy and chemistry at the Universities of Halle, Berlin, and Göttingen.
He received his doctorate on September 18, 1935, from the mineralogist Victor Moritz Goldschmidt with the topic geochemistry of barium.
On July 12, 1939, he obtained the habilitation at the University of Göttingen where he studied decay and construction of minerals in northern German Fuller's earth.
From 1939 to 1944 he was a scientific assistant at the Mineralogical Institute of the University of Göttingen with the mineralogist Carl Wilhelm Correns.