Danilo Montaldi (1 July, 1929-1975) was an Italian Marxist activist and writer who participated in the Autonomist Marxism movement.
Danilo was born in Cremona, Italy. His father was a working class anarchist who had been jailed for two years during the fascist regime. In 1944 he joined the Fronte della Gioventù and participated in the Italian resistance movement. Following the overthrow of fascism, Montaldi was briefly a member of the Italian Communist Party but left owing to their reformism and dogmatism. Montaldi developed links with a diverse range of individuals and organisations involved in far-left. He also published his material in a broad range of journals such as Discussioni, Nuovi Argomenti, Ragionamenti, Opinione, and Passato e Presente.