Gianroberto Casaleggio (; 14 August 1954 – 12 April 2016) was an Italian entrepreneur and political activist. He was co-founder and chairman of Casaleggio Associati srl and editor of Beppe Grillo's blog. He was also co-founder, with Beppe Grillo, of the Five Star Movement, of which he was sometimes called "guru". Casaleggio promoted the Web in Italy as a medium for political communication.