Denis McCaldin is a conductor and a musicologist. He is Director of the Haydn Society of Great Britain and Professor Emeritus of Performance Studies in Music at Lancaster University.

He has worked with many major British orchestras including the Halle, Royal Philharmonic, and Royal Liverpool Philharmonic Orchestras. He also conducts abroad and has worked in Australia, Africa, Europe and North America. Through his association with the London Mozart Players, European Union Chamber Orchestra, Manchester Camerata, and other chamber orchestras, he has developed a special interest in this repertoire, commissioning new works and rediscovering forgotten ones. One if his CD recordings of Schubert & Haydn (featuring his edition of the Little Organ Mass) has received a Gramophone Critic's Choice award.

His research interests are centered on Haydn and on choral and instrumental music of the 18th and 20th centuries. His list of publications features scholarly editions of a number of Haydn's works including his Te Deum, F major Mass, Little Organ Mass and Nelson Mass (OUP, Faber). He has published editions of choral music by Mozart and J.S.Bach (Faber) as well studies of Mahler and Stravinsky (Novello), and Beethoven's choral music [in The Beethoven Companion (Faber)]. Articles and reviews continue to appear in major journals such as Music & Letters, Choir & Organ etc.