Herbert Willoughby Ellis FRES FGS (28 June 1869-15 October 1943) was a British entomologist.^[1][2][3]

Ellis was born in Woodville, Burton-upon-Trent. He attended Nuneaton School and Coppers Hill College before training as an electrician.^[1]

In 1890 he joined the Birmingham Natural History and Philosophical Society. He served as a Vice-President of the society in 1907 and then from 1910 to 1939, and as its President in 1908 and 1909. Ellis was elected as a Fellow of the Royal Entomological Society in 1900 and he served on its council in 1924, 1931, 1936, and 1938.^[1] He was also a member of the British Ornithologists' Union and a Fellow of the Geological Society of London.

Ellis was an avid collector of entomology, especially of coleoptera and amassed a large reference collection. He was responsible for finding and recording the discovery of Arhopalus ferus (then as "Criocephalus polonicus") as new to Britain.^[4] He also corresponded and exchanged specimens with William Gabriel Blatch,^[5] acquiring some of Blatch's collection after his death.^[6]

After his death, Reginald Wagstaffe and Walter Douglas Hincks (both naturalists) were instrumental in purchasing part of his collection for the Yorkshire Museum.^[1] Over 100,000 specimens were purchased in 1945.^[7]

• 1901. "Bagous cylindricus, Payk., in Bedfordshire", Entomologist's Record and Journal of Variation 8, 140.
• 1903. "Coleoptera in the Isle of Wight", Entomologist's Record and Journal of Variation 15, 130-131.
• 1903. Criocephalus polonicus (Molsch.): A Genus and species of Longhorn Coleopteran new to Britain, Entomologist's Record and Journal of Variation 15, 259-260.
• 1904. "Coleoptera", in The Victoria History of the Counties of England - A History of Warwickshire" I, 77-124.
• 1913. "Insects", in British Association for the Advancement of Science: A Handbook for Birmingham and the Neighbourhood, 502-528.