Oliviero Diliberto is an Italian politician. He has been leader of the Party of Italian Communists.

The Party of Italian Communists was a communist party in Italy established in October 1998 by splinters from the Communist Refoundation Party (PRC). The split was led by Armando Cossutta, founder and early leader of the PRC, who opposed Fausto Bertinotti's leaderhip and, especially, his decision to withdraw support from Romano Prodi's first cabinet. In December 2014, the party was transformed into the Communist Party of Italy (PCd'I), which would later evolve into the new version of the Italian Communist Party (PCI).