Valentino Pittoni (German: Valentin Pittoni; May 23, 1872 – April 11, 1933) was a socialist politician from Trieste, who was mainly active in Austria-Hungary. As a follower of Austromarxism and militant of the Social Democratic Workers Party of Austria (SDAPÖ), he came to oppose both Italian irredentism and Slovenian nationalism. In the early 20th century he emerged as the key leader of the socialist movement in the Austrian Littoral region. Pittoni represented Trieste in the Imperial Council, where he became known as a proponent of electoral democracy, and was additionally a member of Trieste's Municipal Council. He set up a cooperative movement, as one of several ventures ensuring inter-ethnic solidarity in the Littoral.