Claudio Grassi (born 12 November 1955 in Reggio Emilia) is an Italian politician.

[citation needed] In his city, Reggio Emilia, he was promoter of the Italy-Nicaragua Association and of the Association for Peace and was also responsible for cultural activities and vice-president of the Antonio Gramsci club.

[citation needed] In 1991 he joined the Communist Refoundation Party, of which he became regional secretary in 1993.

In 1998, Grassi and other executives left the faction of the party's president, Armando Cossutta, opposed to his decision to vote the confidence to the Prodi I Cabinet, by joining the majority of the secretary Fausto Bertinotti with his component, called The Ernesto.

[citation needed] On 1 June 2019, after the resignation of Nicola Fratoianni as secretary, Grassi was appointed regent leader of Italian Left.