National Days in September
49 observances and awareness days are listed for September.
Constitution Day observed in Slovakia on September 1.
National Day observed in Uzbekistan on September 1.
National Day observed in Vietnam on September 2.
National Foundation Day observed in San Marino on September 3.
A United Nations international observance marked on September 5.
National Day observed in Eswatini on September 6.
Independence Day observed in Brazil on September 7.
A United Nations observance promoting international police cooperation.
A United Nations observance raising awareness of Duchenne muscular dystrophy.
Independence Day observed in North Macedonia on September 8.
An official international observance listed by UNESCO and marked on September 8.
National Day observed in Andorra on September 8.
An official international observance listed by UNESCO and marked on September 9.
National Day observed in North Korea on September 9.
National Day observed in Tajikistan on September 9.
A WHO co-sponsored awareness day focused on suicide prevention.
A United Nations international observance marked on September 12.
An official international observance listed by UNESCO and marked on September 13.
Independence Day observed in Costa Rica on September 15.
Independence Day observed in El Salvador on September 15.
Independence Day observed in Guatemala on September 15.
Independence Day observed in Honduras on September 15.
Independence Day observed in Nicaragua on September 15.
An official international observance listed by UNESCO and marked on September 15.
Independence Day observed in Mexico on September 16.
Independence Day observed in Papua New Guinea on September 16.
A United Nations observance recognizing interventional cardiology and cardiovascular health.
A World Health Organization global public-health observance marked on September 17.
A United Nations observance promoting equal pay for work of equal value.
National Day observed in Chile on September 18.
Independence Day observed in Saint Kitts and Nevis on September 19.
An official international observance listed by UNESCO and marked on September 20.
National Day observed in Nepal on September 20.
Independence Day observed in Malta on September 21.
A United Nations day devoted to strengthening the ideals of peace.
National Day observed in Armenia on September 21.
National Day observed in Belize on September 21.
Independence Day observed in Mali on September 22.
A United Nations observance raising awareness of the importance of sign languages.
National Day observed in Saudi Arabia on September 23.
Independence Day observed in Guinea-Bissau on September 24.
A United Nations international observance marked on September 26.
National Day observed in Turkmenistan on September 27.
A United Nations international observance marked on September 27.
An official international observance listed by UNESCO and marked on September 28.
A WHO-recognized global awareness day focused on rabies prevention and elimination.
A United Nations observance promoting awareness and action to reduce food loss and waste.
A United Nations observance honoring language professionals and the role of translation in connecting nations.
National Day observed in Botswana on September 30.
Frequently Asked Questions
No. Official public holidays and UN or government-backed observances are labeled separately from curated awareness days and cultural entries.
Each entry carries a source label where available. The national-days layer avoids presenting weakly sourced awareness days as official holidays.