Jo Haazen (born Antwerp, 24 December 1944) is a Flemish musician and carillonneur.
He studied organ and piano accompaniment at the Royal Flemish Music Conservatory in Antwerp, where thousands listened to his recitals from the tower of Antwerp Cathedral.
Haazen was a driving force in the renaissance of the carillon art in Flanders following World War II.
From 1968 to 1981 he was Antwerp's official municipal carillonneur.
He was instructor of aesthetics, music education, and Esperanto at the Van Celst Institute for Languages, Secretarial Studies, and Tourism and taught Esperanto at the Antwerp Continuing Education program for languages.
From 1981 to 2010 he was municipal carillonneur in Mechelen and director Royal Carillon School "Jef Denyn" in Mechelen.