Augustus Busck (February 18, 1870 in Randers, Denmark[1] – March 7, 1944) was a Danish-American entomologist with the United States Department of Agriculture's Bureau of Entomology.[2] He is best known for his work with microlepidoptera, of which he described over 600 species. His collections of Lepidoptera from North America and the Panama Canal Zone are held by the National Museum of Natural History in Washington, D.C.