Roberto Barzanti (born 24 January 1939 in Monterotondo Marittimo) is an Italian politician.Member of the Italian Socialist Party of Proletarian Unity, Barzanti was elected Mayor of Siena on 2 December 1969.He joined the Italian Communist Party in 1974 and was elected at the European Parliament in 1984, serving for three legislatures (II, III, IV).
He was Vice-President of the European Parliament from 4 January 1992 to 18 July 1994.