Jef Denyn (1862–1941) was a carillon player from Mechelen, Belgium. In 1922, he founded the world's first and most renowned international higher institute of campanology, later named after him, the Royal Carillon School "Jef Denyn" (Dutch: Koninklijke Beiaardschool "Jef Denyn") in Mechelen.
During the First World War, he, his wife Helene, son and four daughters were among those Belgian refugees who fled to England. The Denyn family were taken in by organist and musicologist William Wooding Starmer (1866-) in his house in Tunbridge Wells.