Labour Day, also known as International Workers' Day, is a public holiday celebrated on May 1st in Spain. Unlike how Labour Day is celebrated in September in the United States, most of the world, including Spain, marks the day at the beginning of May. This holiday is dedicated to the labourers and the working class, as it originated from the labour union movement, specifically the eight-hour day movement, which advocated eight hours for work, eight hours for recreation, and eight hours for rest.

In Spain, Labour Day is typically marked by various parades, marches, and rallies organized by unions, worker co-operatives, and other worker solidarity organizations. These events give workers an opportunity to express their concerns and demand better working conditions and higher wages. Many of these rallies and protests can be politically charged, and they often serve as platforms for workers to display their strength, unity, and resolve in the face of ongoing labour issues.

Despite the serious nature of its roots, Labour Day in Spain also has its festive side. It allows workers to take a day off from work and enjoy some of the country's beautiful spring weather. Families usually gather, spending the day together taking advantage of the various cultural activities that cities across the country offer. This holiday serves as a reminder of the efforts, hardships, and sacrifices of the past and current workers in Spain and across the globe.