John Schaeffer is a Dutch born Australian art collector and businessman. Schaeffer predominantly collects 19th-century British art, specialising in works by the Pre-Raphaelite Brotherhood. Schaeffer emigrated to Australia from Holland in the late 1950s, working as a ship's steward. In Australia Schaeffer established a security and cleaning company, Tempo Services Ltd., which he later sold. In 2004 Schaeffer sold Rona, the most expensive house in Sydney, which he had acquired in 1989.