Ernst Gustav Kraatz (13 March 1831 – 2 November 1909) was a German entomologist.[1] He collected and described numerous beetles including Staphylinidae. Kraatz was a founding member of the Berlin Entomological Club (Berliner Entomologischer Verein) and the German entomological society (Deutsche Entomologische Gesellschaft) and the first editor of its journal, the Deutsche Entomologische Zeitschrift. Kraatz was involved in improving the standards of taxonomic description in German entomology and he was a proponent of a national collection that allowed public access to specimens.