Alfredo Noel Iusem (born 10 November 1949, in Buenos Aires) is an Argentine-born Brazilian mathematician working on mathematical optimization.
He earned his Ph.D. from Stanford University in 1981 under the supervision of George Bernard Dantzig.
He is a recipient of Brazil's National Order of Scientific Merit in mathematics. Since 2001, he has been a member of the Brazilian Academy of Sciences.
Regina Burachik was a student of his at Instituto Nacional de Matemática Pura e Aplicada.