Gianroberto Casaleggio (Italian pronunciation: [d?anro'b?rto kaza'ledd?o]; 14 August 1954 – 12 April 2016) was an Italian entrepreneur and political activist, born in Milan.
He was co-founder and chairman of Casaleggio Associati srl, an internet and publishing company that advises on network strategies, 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".
In the Italian context, Casaleggio promoted the Web as a medium for political communication.