International Unemployment Day (March 6, 1930) was a coordinated international campaign of marches and demonstrations, marked by hundreds of thousands of people in major cities around the world taking to the streets to protest mass unemployment associated with the Great Depression. The Unemployment Day marches, organized by the Communist International and coordinated by its various member parties, resulted in two deaths of protestors in Berlin, injuries at events in Vienna and the Basque city of Bilbao, and less violent outcomes in London and Sydney.

In the United States, full-scale riots erupted in New York City and Detroit when thousands of baton-wielding police attacked tens of thousands of marchers. A total of 30 American cities in all saw mass demonstrations as part of the March 6 campaign, including Boston, Milwaukee, Baltimore, Cleveland, Washington, DC, San Francisco, and Seattle.