International Days Calendar

Looking for one observance at a time? The International Days hub lists every observance by month and links to an article on each as it is published.

The international days calendar is the yearly list of dates on which the United Nations, its specialized agencies and other international organizations mark historical events, celebrate human achievement and focus attention on global problems. The subjects run from education, science and health to the environment, agriculture, culture, human rights, peace and sport.

No single worldwide authority registers every awareness day. Some days are proclaimed by the UN General Assembly, some are set by agencies such as UNESCO or the World Health Organization (WHO), and some are led by independent organizations. This calendar runs from January to December, covers the major observances in all three groups and labels each one, so readers can tell an official UN day from an awareness campaign.

Key Takeaways

• International days come from several sources: UN General Assembly resolutions, UN agencies (UNESCO, WHO, FAO, ILO and others) and independent international organizations.
• The “Led by” column shows who is behind each day. “UN” means the General Assembly proclaimed it. Other entries name the agency or organization.
• Dates described as “first Saturday”, “third Thursday” and similar change from year to year, so check the current year’s date before planning an event.
• Several days are new. Peaceful Coexistence (Jan 28) was first observed in 2026. International Wellness Day (Apr 15) and International Day of Greening the Planet (Apr 22) are recent UN designations. Safe, Secure and Trustworthy AI Day (Aug 31) begins in 2027.
• World Prematurity Day is now observed on November 15, not November 17, and November 17 is World Cervical Cancer Elimination Day.
• Awareness months and campaigns such as Movember and Pride Month are listed separately at the end because they are not UN-designated days.

How to Read This Calendar

Each table lists the date, the observance and the body that leads it. UN means the observance was proclaimed by the United Nations General Assembly. Where a UN agency or another organization leads the day, its name or abbreviation appears instead (for example UNESCO, WHO, FAO, ILO, WMO, ITU, IMO, WIPO, UNEP, UNAIDS, ICOM or IFRC). Awareness marks a widely observed day run by a campaign group or professional body rather than by the UN system. For weeks and movable dates, the rule that fixes the date is given in place of a calendar day.

International Days in January

International Days in February

Movable: International Epilepsy Day (second Monday of February) and Safer Internet Day (second Tuesday of February) are both awareness days.

International Days in March

March is one of the busiest months, with a heavy concentration of observances on science, the environment, human rights, mathematics and social development.

Movable: World Kidney Day (second Thursday of March), Earth Hour (usually the last Saturday of March) and World Sleep Day (the Friday before the March equinox) are awareness observances.

International Days in April

April brings together observances on health, technology, creativity, the environment, culture, space exploration and intellectual property.

Movable: International Girls in ICT Day is held on the fourth Thursday of April and is led by the International Telecommunication Union (ITU).

International Days in May

May is rich in observances on culture, agriculture, biodiversity, health, families, technology and human rights.

Movable: World Asthma Day (first Tuesday of May) is an awareness day. World Migratory Bird Day is held on the second Saturday of May and again on the second Saturday of October, and is led by UNEP and its partner conventions. International Day of Vesak (Day of the Full Moon) follows the lunar calendar and falls in May in most years.

International Days in June

June centers on the environment, oceans, food security, human rights, humanitarian affairs, children and public services.

International Days in July

July focuses on population, development, youth, international cooperation, friendship, space exploration, conservation and humanitarian issues.

International Days in August

August is associated with Indigenous peoples, youth, humanitarian assistance, cultural heritage, peace and security.

International Days in September

September is important for literacy, education, democracy, peace, science, sustainability, tourism and international cooperation.

Movable: World Maritime Day, led by the International Maritime Organization (IMO), is held in the last week of September and falls on a Thursday (September 24 in 2026).

International Days in October

October covers education, agriculture, food security, poverty reduction, international cooperation, technology, health and urban development.

Movable: World Habitat Day (first Monday of October) and World Sight Day (second Thursday of October). World Migratory Bird Day is also held on the second Saturday of October.

International Days in November

November includes observances on science, philosophy, health, children, journalism, industrial development, transportation and the protection of women and vulnerable people.

Movable: International Day against Violence and Bullying at School, including Cyberbullying (first Thursday of November, UNESCO), World Philosophy Day (third Thursday of November, UNESCO; November 19 in 2026) and World Day of Remembrance for Road Traffic Victims (third Sunday of November, UN).

International Days in December

December closes the year with observances on human rights, peace, health, international solidarity, environmental protection and migration.

Awareness Months and Campaign Periods

Some observances run for weeks or a whole month. Most of those below are campaigns run by civil society groups or national bodies, not UN-designated days.

Frequently Asked Questions

What is the difference between a UN international day and an awareness day? A UN international day is proclaimed by a General Assembly resolution, or by the governing body of an agency such as the UNESCO General Conference or the World Health Assembly. An awareness day is set by a campaign group, professional body or other organization. Both can be widely observed, but only the first carries formal UN status.

How are international days created? Most start with a proposal from one or more countries, which the General Assembly adopts as a resolution. Agencies follow their own processes. Recent examples are the International Day of Peaceful Coexistence (adopted March 2025, first observed January 28, 2026) and International Anti-Cybercrime Day (December 24, designated in 2024).

Which international days are the most widely observed? The UN has pointed to International Women’s Day (March 8), World Water Day (March 22), the International Day of Peace (September 21) and Human Rights Day (December 10) among its most popular observances.

Why do some dates change from year to year? Some days are tied to a rule instead of a calendar date, such as the second Thursday of March or the third Sunday of November. Others, like the Day of Vesak, follow a lunar calendar. Always confirm the date for the year you are planning.

How many global health days does WHO officially recognize? WHO’s campaigns page lists the days and weeks its Member States have mandated as official global public health observances. They include World Tuberculosis Day, World Health Day, World Malaria Day, World No Tobacco Day, World Blood Donor Day, World Hepatitis Day, World Patient Safety Day, World Prematurity Day, World AIDS Day and World Antimicrobial Resistance Awareness Week. WHO also supports many other days.

Does the UN have days for its official languages? Yes. French (March 20), Chinese (April 20), English (April 23), Spanish (April 23), Russian (June 6) and Arabic (December 18) each have a language day.

The Bottom Line

International days are a shared calendar for global attention. Used well, they give schools, newsrooms, nonprofits and workplaces a predictable hook for education and action. Treat the “Led by” column as a guide to how official a day is, and check the current year’s date for any movable observance before you plan around it.

Editorially reviewed by Specialty Digest Editorial TeamLast reviewed November 14, 2026Researched and drafted with AI assistanceReport an issue