henry willis (born: 27 april 1821, london - died: 11 february 1901, london) was a british builder of pipe organs. he built a very large number of organs, many of them for big cathedrals and concert halls in britain, such as st. paul's cathedral, truro cathedral, and the royal albert hall. he also built an organ for queen victoria at windsor castle. many of the organs that he built are in other parts of the world, especially in countries that belonged to the british empire.