Wilhelm Joseph Grailich (16 February 1829, in Pressburg – 13 September 1859, in Vienna) was an Austrian physicist, mineralogist and crystallographer.
Grailich served as an assistant to Andreas von Ettingshausen in the institute of physics at the University of Vienna.
In 1857 he became an associate professor of higher physics at the university, and in 1859, was chosen as a member of the Vienna Academy of Sciences.
In 1856, he translated William Hallowes Miller's textbook of crystallography into German as "Lehrbuch der Kristallographie".
[1] He explained the phenomenon of fluorescence in crystals,[4] and is credited for making improvements to Wheatstone's vibration apparatus (in German: "Schwingungsapparat").