Sir Percy Carter Buck (25 March 1871 – 3 October 1947) was an English music educator, writer, organist, and composer. He was born in London, and studied at Merchant Taylors' School and the Royal College of Music. He was the organist at Worcester College, Oxford (1891–94), Wells Cathedral (1896–99), and Bristol Cathedral (1899–1901). He was then appointed as director of music at Harrow School, and held that post until 1927. From 1910 to 1920, he was Professor of Music at Trinity College, Dublin; this was a non-residential post.