Onorato Damen (4 December 1893 – 14 October 1979), was an Italian left communist revolutionary who was first active in the Italian Socialist Party and then the Communist Party of Italy.
After being expelled, he worked with the organized Italian left, became one of the leaders of the Internationalist Communist Party, commonly known by their paper Battaglia Comunista.
The Internationalist Communist Party, formally founded in 1943, was numerically the largest left communist organization in the post-World War II period.
In 1952, Amadeo Bordiga, who had by then fully came out of retirement, split the party to found the International Communist Party, known by its paper Programma Comunista.
A majority
followed Damen whose group maintained the original name Internationalist Communist Party, the original theoretical journal Promoteo, as well as the paper Battaglia Communista.
Onorato Damen was politically active his entire adult life.
He was the author of books Bordiga Beyond the Myth and Gramsci between Marxism and Idealism.