Julius Roger (1819–1865) was a German medical doctor, entomologist and folklorist who worked in Ratibor, in Upper Silesia, most notable for having arranged (and raised the necessary monies) to build hospitals in Groß Rauden, Pilchowitz, plus the current public hospital in Rybnik.He is also notable for collaborating with entomologist Ernst Gustav Kraatz, contributing to Gustav Kraatz's founding German Entomological Institute collections; for identifying and discovering over 400 new species of beetles plus other insects; and also for collecting folk songs (a collection of 546 songs huntsmens songs, pastoral and farmers songs, Gypsy songs, ballads, and love songs)