Eugenio Colorni (22 April 1909 - 30 May 1944) was an Italian philosopher and anti-fascist activist.
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, who dedicated his book Exit, Voice, and Loyalty to Colorni's memory. 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 1938 he was arrested for his anti-fascist political activity. He escaped but was killed in Rome by a Nazi ambush in 1944, shortly before the Allies arrived. He and Ursula Hirschmann had three daughters: Silvia, Renata and Eva. His youngest daughter Eva married Indian economist Amartya Sen and they had a son, Kabir, and a daughter, Indrani.
- 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
- Lyas, Colin (2012). "Colorni, Eugenio". In Stuart Brown; Diane Collinson; Robert Wilkinson (eds.). Biographical Dictionary of Twentieth-Century Philosophers. Routledge. pp. 259–6. ISBN 978-1-134-92795-1.
- Geoffrey Hawthorn, 'Plan it mañana', London Review of Books Vol. 36 No. 17, 11 September 2014, pp.34-7
- Hirschman, Albert O. (1970). Exit, Voice, and Loyalty: Responses to Decline in Firms, Organizations, and States. Harvard University Press. p. 7. ISBN 978-0-674-27660-4.