Eugenio Colorni (22 April 1909 – 30 May 1944) was an Italian philosopher and anti-fascist activist.^[1]

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Born in Milan, Colorni taught philosophy at the University of Trieste, and was active in the anti-fascist Giustizia e Libertà movement. He married Ursula Hirschmann, and was an important influence on her brother Albert O. Hirschman,^[2] who dedicated his book Exit, Voice, and Loyalty to Colorni's memory.^[3] Colorni was one of the promoters of the Ventotene Manifesto and an early instigator of the European Federalist Movement. In the mid 1930s, he was closely associated with Lelio Basso and others. In October 1938 he and Dino Philipson were arrested for their anti-fascist political activity and their Jewish background.^[4] He escaped but was killed in Rome by a Nazi ambush in 1944, shortly before the Allies arrived.^[1] He had three daughters: Silvia, Renata, and Eva. His youngest daughter Eva married Indian economist Amartya Sen in 1978 and produced two children prior to her death seven years later.

• L'estetica di Benedetto Croce: studio critico, 1932
• (ed.) Leibniz, La Monadologia, 1935
• Leibniz e il misticismo, 1938
• 'Filosofia e scienza', Analysis, 1947
• 'Apologo', Sigma, 1947
• 'I'dialoghi di Commodo', Sigma, 1949
• 'Critica filosofia e fisica teoria', Sigma, 1948
• Scritt, Florence: La Nuova Italia, 1975