Antonio Labriola (Italian pronunciation: [anˈtɔnjo labriˈɔla]; July 2, 1843 – February 12, 1904) was an Italian Marxist theoretician. Although an academic philosopher and never an active member of any Marxist political party, his thought exerted influence on many political theorists in Italy during the early 20th century, including the founder of the Italian Liberal Party, Benedetto Croce and the leaders of the Italian Communist Party, Antonio Gramsci and Amadeo Bordiga.