Labour Day, celebrated on May 1st in Cambodia, is a public holiday that honors the labor movement and the contributions that workers have made to the development, growth, and economic and social prosperity of the country. Known locally as 'International Workers' Day' or 'May Day', it is a day of political demonstrations and celebrations organized by unions, communists, and other groups. It is an opportunity for Cambodians to advocate for workers’ rights, decent employment, and social protection for all, including the vulnerable and disadvantaged.

Typically, the day starts with speeches from labor leaders and government officials, ensues with parades and marches through the streets of major cities. The gatherings are often accompanied by music, dance, and social events. Public and private organizations, including trade and labor associations, arrange meetings, and rallies in solidarity with laborers. Many families also spend the day relaxing or visiting places of entertainment. However, the bereft of the stringent labor laws in the country tends to bring about protests and demonstrations for labor reforms and better wages.

Labour Day in Cambodia is part of a global celebration, it's one of the 28 public holidays the country observes, all of which demonstrate the government's recognition of the importance of holidays in maintaining morale and giving individuals a chance to rest and celebrate. Nevertheless, issues around labor rights and socioeconomic inequality persist, and the holiday serves as a time for reflection on these issues. As such, gatherings and events may often be tinged with both celebration and a sense of continuing struggle.