The Formazioni Di Difesa Proletaria (transl. Proletarian Defense Formations) were Italian anti-fascist formations, born during the two-year Biennio Rosso period in Italy (1919–1920), later organized as a united front between 1921 and 1922.

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The birth of the workers' defense formations was contextual to the birth of the Fasci Italiani di Combattimento, created by Benito Mussolini, and to the presentation of their manifesto.

• Italian resistance movement