Denis Arnold

Denis Midgley Arnold, CBE (15 December 1926 – 1986) was a British musicologist. He was born in Sheffield. After work in the extramural department of The Queen's University, Belfast, he became a Lecturer in Music at the University of Hull, and from 1969 to 1975 was Professor of Music at The University of Nottingham. From 1975 he was Heather Professor of Music at Oxford University. He served as editor of Music & Letters.

He is best known for his editing of The New Oxford Companion to Music (1983, Oxford University Press), which under his editorship grew to a 2 volume work of some 2000 pages, with a broader coverage than Percy Scholes' original; and for his work on the music of Monteverdi, Marenzio and Giovanni Gabrieli. He was a frequent broadcaster. The Denis Arnold Hall at the University of Oxford, and the Denis Arnold Music Library at the University of Nottingham are both named after him.