1917–1919 Brazil strike movement was a Brazilian industry and commerce strike starting in July 1917 in São Paulo, during World War I, promoting by anarchist-inspired workers' organizations allied with the libertarian press. From 1917 to 1919, a large strike movement shook the First Brazilian Republic, concentrated in São Paulo and Rio de Janeiro. It culminated in several general strikes in 1917 and an attempted anarchist uprising in November 1918. The 1917 general strike is considered the first general strike in the labor history of Brazil, and marks the beginning of the period known as the five red years.

The First Brazilian Republic, also referred to as the Old Republic, officially the Republic of the United States of Brazil, refers to the period of Brazilian history from 1889 to 1930. The Old Republic began with the deposition of Emperor Pedro II in 1889, and ended with the Brazilian Revolution of 1930 that installed Getúlio Vargas as a new president. During the First Brazilian Republic, Brazil was dominated by a form of machine politics known as coronelism, in which the political and economic spheres were dominated by large landholders. The most powerful of such landholders were the coffee industry of São Paulo and the dairy industry of Minas Gerais. Because of the power of these two industries, the Old Republic's political system has been described as "milk coffee politics."