Free speech fights are struggles over free speech, and especially those struggles which involved the Industrial Workers of the World and their attempts to gain awareness for labor issues by organizing workers and urging them to use their collective voice. During the World War I period in the United States, the IWW members (referred to as Wobblies), engaged in free speech fights over labor issues which were closely connected to the developing industrial world as well as the Socialist Party. The Wobblies, along with other radical groups, were often met with opposition (violent and otherwise) from local governments and especially business leaders, in their free speech fights.

The IWW organized transient workers (especially in cities in the American West) who worked in highly seasonal jobs—they met on the streets, discussed contemporary issues, and listened to speakers; at the time, it was a very popular method of organization. The events often ended with the police arresting them for participating in street meetings. The most notorious of all of the free speech fights was the San Diego free speech fight, which won a significant amount of public awareness for the IWW as it involved tremendous violence against the labor groups organized by the IWW. which brought the IWW to the greater notice of the American public and was notable for the intensity of violence by anti-labor vigilantes directed at the IWW; this violence included the kidnapping and tarring and feathering of Ben Reitman, who was a physician, and was Emma Goldman's lover.

More generally, a free speech fight is any incident in which a group is involved in a conflict over its speech. For instance, the Free Speech Movement, which began with a conflict on the Berkeley Campus in California in the 1960s, was a "free speech fight".