Ettore Mazzoleni was a Canadian conductor, music educator, writer, and arts administrator of Swiss birth. He was one of the Canadian Opera Company's principal conductors during its early years, working there from 1958 to 1968. For many years he was the program annotator of the Toronto Symphony Orchestra (TSO) and also served as the orchestra's associate conductor from 1942 to 1948. He became a naturalized Canadian citizen in 1949.