Gustav Leonhardt (30 May 1928 – 16 January 2012) was a renowned Dutch keyboard player, conductor, musicologist, teacher and editor. He was a leading figure in the movement to perform music on period instruments. He professionally played many instruments, including the harpsichord, pipe organ, claviorganum (a combination of harpsichord and organ), clavichord and fortepiano. He also conducted orchestras and choruses.