Giancarlo Ghirardi (28 October 1935 – 1 June 2018) was an Italian physicist and emeritus professor of theoretical physics at the University of Trieste. He is well known for the Ghirardi–Rimini–Weber theory (GRW), which he proposed in 1985 together with Alberto Rimini and Tullio Weber, and for his contributions to the foundations of quantum mechanics. He independently rederived, in a referee report to Foundations of Physics, the no-cloning theorem, before the works byWootters and Zurek and by Dieks in 1982,but after the actual first derivation byPark in 1970.