Ebbe Schmidt Nielsen (7 June 1950 – 7 March 2001) was a Danish entomologist influential in systematics and Lepidoptera research, and an early proponent of biodiversity informatics. The journal Invertebrate Systematics was established with significant contributions from Nielsen, and he assisted in the founding of the Global Biodiversity Information Facility (GBIF). Nielsen wrote several books, published over eighty scientific papers, and was highly regarded within the scientific community. Following his death, the GBIF organised the Ebbe Nielsen Prize in his memory, awarded annually to promising researchers in the field of biodiversity informatics. The moth Pollanisus nielseni is named after Nielsen.