Louis Beethoven Prout (1864–1943) was an English entomologist and musicologist.
Prout specialised in the insect order of Lepidoptera, especially the Geometridae, or geometer moths, on which he was a foremost authority.
[1] He contributed the sections on geometer moths in Philogène Wytsman's Genera Insectorum and in The Macrolepidoptera of the World, the English-language version of Adalbert Seitz's Die Gross-Schmetterlinge der Erde.
[2] Prout's notebooks and publications formed the basis of the Geometridae card indexes in the Natural History Museum, the then British Museum (Natural History).
[3] He is not to be confused with his sister Alice Ellen Prout who was a fellow of the Entomological Society of London.