Agostino Lanzillo (31 October 1886 – 3 March 1952) was an Italian revolutionary syndicalist leader who later became a member of Benito Mussolini's fascist movement.

He acquired a law degree from the University of Rome and wrote his thesis on the socialist Pierre-Joseph Proudhon.

[4] Lanzillo also contributed to the syndicalist journals Avanguardia Socialista and Il divenire sociale.

In 1909, Georges Sorel started collaborating with the French nationalist-monarchist movement Action Française, creating national syndicalism.

From 1912, Lanzillo published under Benito Mussolini editorship, contributing to Avanti!, Utopia and Il Popolo d'Italia.