March 1, 2031
- Bosnia and Herzegovina
- Independence Day
- Switzerland
- Instauration de la République
- Spain
- Día de les Illes Balears
- South Korea
- Independence Movement Day
- Paraguay
- Heroes' Day
March 2, 2031
- Anguilla
- James Ronald Webster Day
- Brazil
- Revolução Pernambucana de 1817
- Ethiopia
- Victory at Adwa Day
- Puerto Rico
- American Citizenship Day
March 3, 2031
- Australia
- Labour Day
- Bulgaria
- Liberation Day
- Georgia
- Mother's Day
- Guam
- Guam History and Chamorro Heritage Day
- Malawi
- Martyrs' Day
- United States of America
- Casimir Pulaski Day
- British Virgin Islands
- The Anniversary of the Birth of Hamilton Lavity Stoutt
- Timor Leste
- Veteran's Day
March 4, 2031
- Malaysia
- Anniversary of Installation of the Sultan of Terengganu
- United States of America
- Town Meeting Day
March 5, 2031
- Vanuatu
- Fête des chefs coutumiers
March 6, 2031
- Ghana
- Independence Day
March 8, 2031
- Armenia
- International Women's Day
- Angola
- International Woman's Day
- Azerbaijan
- International Women's Day
- Bosnia and Herzegovina
- Day of the Establishment of the District
- Burkina Faso
- International Women's Day
- Brazil
- Alusivo ao Dia Internacional da Mulher
- Belarus
- International Women's Day
- Germany
- International Women's Day
- Western Sahara
- First Martyr
- Eritrea
- International Women's Day
- Georgia
- International Women's Day
- Guinea-Bissau
- International Women's Day
- Moldova
- International Women's Day
- Madagascar
- International Women's Day
- Russia
- International Women's Day
- Sierra Leone
- International Women's Day
- South Sudan
- International Women's Day
- Ukraine
- International Women's Day
- Uganda
- International Women's Day
- Cambodia
- International Women's Rights Day
- Kazakhstan
- International Women's Day
- Laos
- International Women's Rights Day
- Uzbekistan
- Women's Day
- China
- International Women's Day
March 9, 2031
- Zambia
- Women’s Day
March 10, 2031
- Australia
- Canberra Day (ACT)
- Adelaide Cup Day (SA)
- Eight Hours Day (TAS)
- Labour Day (VIC)
- Azerbaijan
- International Women's Day (substitute day)
- Belize
- Baron Bliss Day
- Gibraltar
- Commonwealth Day
- New Zealand
- Provincial anniversary day
- Turks & Caicos Islands
- Commonwealth Day
- Ukraine
- International Women's Day
- British Virgin Islands
- Commonwealth Day
- Kazakhstan
- International Women's Day (observed)
- Laos
- International Women's Rights Day (in lieu)
- Uzbekistan
- Women's Day (observed)
March 13, 2031
- Vatican City
- Anniversary of the election of Pope Francis
March 14, 2031
- Andorra
- Constitution Day
- Albania
- Summer Day
- St. Vincent & Grenadines
- National Hero′s Day
March 17, 2031
- People's Republic of Bangladesh
- Mujib's Birthday & Children's Day
- United Kingdom
- St Patrick's Day
- Ireland
- St. Patrick’s Day
- Montserrat
- Saint Patrick's Day
- Mexico
- Benito Juárez's birthday (day off)
- United States of America
- Evacuation Day (MA)
March 19, 2031
- Brazil
- Dia de São José
- Switzerland
- Saint Joseph
- Spain
- Saint Joseph
- Malta
- Saint Joseph
- Vatican City
- Saint Joseph
March 20, 2031
- Azerbaijan
- Spring Festival
- Cocos (Keeling) Islands
- Labour Day
- Iran
- Nationalization of the Iranian oil industry
- Tunisia
- عيد الإستقلال
- Papua New Guinea
- March Equinox
March 21, 2031
- Iran
- Nowruz
- Japan
- Spring Equinox Day
- Mexico
- Benito Juárez's birthday
- Namibia
- Independence Day
- South Africa
- Human Rights Day
- Kazakhstan
- Nowruz holiday
- Uzbekistan
- Nowruz
March 22, 2031
- Albania
- Sultan Nevruz's Day
- Iran
- Nowruz
- Puerto Rico
- Emancipation Day
- Kazakhstan
- Nowruz holiday
March 23, 2031
- Iran
- Nowruz
- Malaysia
- Sultan of Johor's Birthday
- Kazakhstan
- Nowruz holiday
March 24, 2031
- Argentina
- Day of Remembrance for Truth and Justice
- Colombia
- Saint Joseph
- Christmas Island
- Labour Day
- Iran
- Nowruz
- New Zealand
- Provincial anniversary day
- Kazakhstan
- Nowruz holiday (observed)
March 25, 2031
- Brazil
- Data magna do estado
- Cyprus
- Annunciation, Anniversary of 1821 Revolution
- Greece
- Annunciation, Anniversary of 1821 Revolution
- San Marino
- Anniversary of the Arengo
- Kazakhstan
- Nowruz holiday (observed)
March 26, 2031
- People's Republic of Bangladesh
- Independence Day
- Republic of Mali
- Martyrs' Day
- United States of America
- Prince Jonah Kuhio Kalanianaole Day
March 28, 2031
- Ethiopia
- Day of Lament
March 29, 2031
- Central African Republic
- Boganda Day
- Madagascar
- Martyrs' Day
March 30, 2031
- Åland Islands
- Demilitarization Day
- Trinidad & Tobago
- Spiritual Baptist Liberation Day
March 31, 2031
- Brunei
- Armed Forces Day
- Malta
- Freedom Day
- Trinidad & Tobago
- Spiritual Baptist Liberation Day (substitute day)
- United States of America
- Seward's Day (AK)
- César Chávez Day (CA)
- U.S. Virgin Islands
- Transfer Day
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