Herbert Willoughby Ellis FRES FGS (28 June 1869-15 October 1943) was a British entomologist.
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.
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.
[6] After his death, Reginald Wagstaffe and Walter Douglas Hincks (both naturalists) were instrumental in purchasing part of his collection for the Yorkshire Museum.