William Ifor Jones (January 23, 1900 – November 11, 1988) was a Welsh conductor and organist. Born into a large coal-mining family and raised in Merthyr Tydfil, Jones studied at the Royal Academy of Music as a scholarship student in London from 1920 to 1925. He studied the organ with Sir Stanley Marchant at St. Paul's Cathedral, London; orchestral conducting with Ernest Read and with Sir Henry Wood, (he became Wood's assistant at the Queen's Hall Orchestra); and harmony with Benjamin Dale. He was for a time organist at the Welsh Baptist Church in Castle Street, London, worked at the Royal Opera House, as a vocal coach at Covent Garden, assisted with the British National Opera Company in the role of prompter, and was the Assistant Choir Master at St. Paul's Cathedral, London.