Labor Day in the United States is a holiday celebrated on the first Monday in September. It is a celebration of the American labor movement and is dedicated to the social and economic achievements of workers. It constitutes a yearly national tribute to the contributions workers have made to the strength, prosperity, and well-being of their country.

Labor Day was promoted by the Central Labor Union and the Knights of Labor, who organized the first parade in New York City. After the Haymarket Massacre, which occurred in Chicago on May 4, 1886, U.S. President Grover Cleveland feared that commemorating Labor Day on May 1 could become an opportunity to commemorate the affair. Thus, in 1887, it was established as an official holiday in September to support the Labor Day that the Knights favored.[1]

The equivalent holiday in Canada, Labour Day, is also celebrated on the first Monday of September. In many other countries (more than 80 worldwide), 'Labour Day' is synonymous with, or linked with, International Workers' Day, which is observed on May 1..