Victor-Charles Mahillon (March 10, 1841 in Brussels – June 17, 1924 in Saint-Jean-Cap-Ferrat, France) was a Belgian musician, instrument builder and writer on musical topics.
While his work in acoustics was advanced for the time, and has some historical interest, it has been largely supplanted.
In addition to gathering a large number of historically interesting European wind instruments, he collected many ethnologically interesting specimens from around the world and prepared a three volume catalog of these (in French).
In 1885 he provided instruments to Alfred James Hipkins for use in a series of concerts at the International Inventions Exhibition in London.
His classification of instruments was later adopted by Erich von Hornbostel and Curt Sachs, and is still in use today.