May Day / International Workers’ Day2026 · Date · History · Messages
The International Labour Organization marks May Day on 1 May and publishes current worker-focused material.
About May Day / International Workers’ Day
May Day, also widely known as International Workers’ Day or Labour Day, is observed on 1 May in many countries as a day connected with workers, labour rights and solidarity. Public-holiday status and local traditions vary by country.
The modern labour observance developed from the late-19th-century movement for an eight-hour working day and the events surrounding the 1886 labour struggle in Chicago.
Why May Day / International Workers’ Day matters
The day is associated with workers’ rights, working conditions, collective organization and the social importance of labour. Its meaning can vary from formal state ceremonies and public holidays to trade-union marches, community events or political demonstrations.
Because May Day also has older spring-festival traditions in parts of Europe, a careful guide should distinguish the international workers’ observance from unrelated seasonal May Day customs.
History of May Day / International Workers’ Day
On 1 May 1886, workers in the United States joined a large movement for the eight-hour day. In Chicago, later violence around the Haymarket affair became a major reference point in international labour history.
Library of Congress material says that by 1890 May Day had become International Workers’ Day. ILO material likewise traces the observance to the 1880s labour struggle and notes formal recognition as Labour or International Workers Day in 1891.
The observance subsequently spread through labour movements and national calendars around the world, but there is no single universal law that makes 1 May a public holiday everywhere.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
1886 eight-hour-day strike movement and Chicago labour demonstrations
The 1886 labour struggle became a central historical reference for the international workers’ observance that developed around 1 May.
International labour movement
ILO and Library of Congress material trace the modern workers’ observance to the international labour movement and the campaign for an eight-hour day.
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
7 fields not established in reviewed sources
Predecessor and precursor observances
Earlier or merged observances are kept separate from former names and later institutional actions.
Also known as
May Day
How to Observe May Day / International Workers’ Day
Learn about labour history in your own country, including the development of working-time, safety and collective-bargaining protections.
Attend lawful public events, educational programmes or labour-history exhibitions connected with 1 May.
Recognize workers whose labour is essential but often overlooked, while keeping the day’s historical labour-rights context visible.
Check local law before describing 1 May as a public holiday, because official status differs by jurisdiction.
May Day / International Workers’ Day Facts
May Day / International Workers’ Day is observed on 1 May.
The modern labour observance has roots in the 1880s campaign for an eight-hour working day.
The 1886 Chicago labour events and Haymarket affair became central to the date’s international labour history.
Library of Congress material says that by 1890 May Day had become International Workers’ Day; ILO material notes formal recognition in 1891.
Public-holiday status varies by country, so the day should not be described as a universal legal holiday.
May Day / International Workers’ Day Messages
On International Workers’ Day, may every worker be treated with dignity, safety and respect.
Wishing workers everywhere a meaningful May Day and recognition for the skill, effort and care behind their work.
On May Day, honouring the people whose labour keeps communities, services and economies moving.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
International Labour Organization — May Day: The International Day of Labour (opens in a new tab)
International Labour Organization — Why do fundamental labour standards matter? (opens in a new tab)
Library of Congress — Today in History: May Day as Workers’ Day (opens in a new tab)
International Labour Organization — May Day 2026 (opens in a new tab)
Intergovernmental
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is May Day / International Workers’ Day?
1 May The documented recurrence rule is: 1 May.
Does May Day / International Workers’ Day fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is May Day / International Workers’ Day an official public holiday?
The reviewed sources verify it within this scope: International labour movement observance; public-holiday status varies by country. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes May Day / International Workers’ Day?
The documented basis is: The International Labour Organization marks May Day on 1 May and publishes current worker-focused material.. Supporting evidence includes International Labour Organization — May Day 2026. The site does not infer a separate creator or founder unless reviewed evidence establishes one.
Is May Day / International Workers’ Day international or country-specific?
The documented scope is international or global: International labour movement observance; public-holiday status varies by country. That does not mean every country treats the date as a public holiday or observes it in the same way.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-09-07.
When is International Workers’ Day?
It is observed on 1 May.
Why is May 1 associated with workers?
The modern labour observance grew from the late-19th-century movement for the eight-hour workday, especially the 1886 U.S. labour struggle and the international movement that followed.
Is May Day a public holiday everywhere?
No. It is a public holiday in many countries, but legal status and official names vary by jurisdiction.
Other observances on May 1
These observances are also listed on May 1, 2027.
Calan Mai
Museum Wales and Wales.com identify Calan Mai on 1 May as a traditional Welsh seasonal celebration associated with the beginning of summer and regionally varied folk customs.
Constitution Day
Republic of the Marshall Islands parliamentary and diplomatic sources verify May 1 Constitution Day, the Constitution’s May 1, 1979 parliamentary commencement date, and current national-hol…
Global Love Day
The Love Foundation states that the first Global Love Day was presented on May 1, 2004 and maintains the annual observance through current 2026 material.
International Doodle Dog Day
The official International Doodle Dog Day site states that doodle dog lovers celebrate every year on May 1 and identifies Jeannie North as the founder.
International Sunflower Guerrilla Gardening Day
GuerrillaGardening.org documents International Sunflower Guerrilla Gardening Day on 1 May and says Brussels guerrilla gardeners declared it in 2007.
Keep Kids Alive Drive 25 Day
Keep Kids Alive Drive 25 identifies May 1 as KKAD25 Day and describes the 2026 observance as its 20th annual nationwide proclamation effort.