David Gruby (20 August 1810 – 14 November 1898) was a Hungarian physician born in the village of Kis-Kér (now Bačko Dobro Polje, Serbia) to a poor Jewish farmer. He received his doctorate in Vienna and performed scientific research in Paris. Gruby is remembered as a pioneer in the fields of microbiology and medical mycology. Most of his important work was done during the 1840s. In 1841 he described the fungus associated with favus, a discovery that was independent of Johann Lukas Schönlein's (1793–1864) findings. Later, the fungal parasite was called Achorion schoenleinii in Schönlein's honor.