John (Jean) Iliopoulos (Greek: Ιωάννης Ηλιόπουλος; 1940) is a Greek physicist. He is the first person to present the Standard Model of particle physics in a single report. He is best known for his prediction of the charm quark with Sheldon Glashow and Luciano Maiani (the "GIM mechanism"). Iliopoulos is also known for demonstrating the cancellation of anomalies in the Standard model. He is further known for the Fayet–Iliopoulos D-term formula, which was introduced in 1974. He is currently an honorary member of Laboratory of theoretical physics of École normale supérieure, Paris.
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