Jan Willem van Otterloo (27 December 1907 – 27 July 1978) was a Dutch conductor, cellist and composer.

While playing as a cellist in the Utrecht Stedelijk Orkest, he won a composition prize from the Concertgebouw Orchestra for his Suite No.

[1] Particularly prized for his performances of 19th and 20th-century music, he made numerous commercial recordings, mostly for Philips Records, with Residentie Orkest, Concertgebouworkest, Berlin Philharmonic, Vienna Philharmonic, Vienna Symphony, Orchestre Lamoureux and (on much rarer occasions) the Sydney Symphony.

He died in the Melbourne suburb of East St Kilda in 1978 from injuries suffered in an automobile accident.

On 22 April 1941 he married Anette Jacoba Adriana Heukers, with whom in December of that year he had a son, Rogier van Otterloo (1941–1988),[3] who would become a well-known conductor in the Netherlands as well.