Cornelis William Hendrik Fuhler (3 July 1964 – 19 July 2020) was a Dutch/Australian improvisor, composer, and instrument builder associated with free jazz, experimental music and acoustic ecology. He played piano by manipulating sound with electromagnetic string stimulators like Ebows and motorized actuators. Fuhler also performed on guitar, turntables and synthesizer. He invented the keyolin, a combination of keyboard and violin.
Fuhler was a student of Misha Mengelberg of the Instant Composers Pool. He recorded the album Corkestra (Data, 2005) with Ab Baars, Tony Buck, Tobias Delius, Wilbert de Joode, Anne La Berge, Andy Moor, Nora Mulder, and Michael Vatcher. Fuhler played prepared piano, analog keyboards, clavinet, melodica, and electric lamellophone. Fuhler played solo prepared piano on his album Stengam (Potlatch, 2007). In 2016 he attained a PhD in composition at the University of Sydney and in 2017 he published his book Disperse and Display covering modular composing strategies and extended piano techniques.