The Castilian War of the Communities, also known as the Revolt of the Comuneros, is an uprising by citizens of Castilian communities against the rule of Charles V and his administration.

It takes place between April 16, 1520 and February 3, 1522.

According to some scholars, this revolt had elements of a modern revolution, notably because of the mixture of hate for social injustice and unfair taxation and the ideals of democracy and freedom were among the causes of the uprising.