Giovanni Jona-Lasinio (born 1932), sometimes called Gianni Jona, is an Italian theoretical physicist, best known for his works on quantum field theory and statistical mechanics. He pioneered research concerning spontaneous symmetry breaking, and the Nambu–Jona-Lasinio model is named after him. When Yoichiro Nambu received the Nobel Prize, Jona-Lasinio gave the Nobel Lecture in his place, as a recognition from Nambu for their joint work. At present, he holds a faculty position in the Physics Department of Sapienza University of Rome, and is a full member of the Accademia dei Lincei.