William Holder FRS (1616 – 24 January 1698) was an English clergyman and music theorist of the 17th century.
His most notable work was his widely known 1694 publication A Treatise on the Natural Grounds and Principles of Harmony.
A few of his musical compositions survive in the British Library in the Harleian MSS 7338 and 7339.
[3] In 1660 at Bletchingdon he taught a deaf mute, Alexander Popham to speak "plainly and distinctly, and with a good and graceful tone".
The division of credit for this between Holder and John Wallis became a matter of dispute in the Royal Society.