Dutch organist. Jaap Zwart Sr. (May 23, 1924 – March 26, 2001).
Study at the Amsterdam Conservatory. Was organist in Zaandam and Amersfoort; conductor of many choirs.
He is the son of Jan Zwart ('Jzn' meaning 'Janszoon', son of Jan Zwart) and father of Jaap Zwart Jr. (b. 1955)