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Flag Days of September

Months of the Year

Days of September

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30

1

Estonia - Day of Knowledge
Libya - Revolution Anniversary, 1969
Slovakia - Constitution Day, 1992
USA - Labor Day (varies - first Monday of September) - questionable as a flag day
Uzbekistan - Independence Day, 1991

2

Vietnam - Republic Day, 1945

3

Australia
by António Martins
- Flag Day, 1901
Qatar - Independence Day, 1971
San Marino - St. Marinus Day, 301
UK - Merchant Navy Day (Red Ensign); Canada - Merchant Navy Remembrance Day; Australia - Merchant Navy Day (Australian Red Ensign); New Zealand - Merchant Navy Day (New Zealand Red Ensign)

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5

Denmark - flag day in honor of deployed Danish soldiers.
Mozambique
by Željko Heimer
- Flag Day, 1974
Samoa - National Holiday

6

Pakistan - Defence Day, 1965
São Tomé and Príncipe - National Heroes' Day
Swaziland - Independence Day, 1968

7

Brazil - Independence Proclamation Day
Kuwait
by Željko Heimer
- Flag Day, 1961
Tehuelche people

8

Andorra - La Vierge de Meritxell
Macedonia - Independence Day
UK - His Majesty's Accession, 2022

9

Bulgaria - Socialist Revolution Anniversary, 1944
California, USA - Statehood Day, 1850
Indonesia - National Sports Day
North Korea - Establishment of the Republic Day, 1948
Tajikistan - Independence Day, 1991

10

Belize - Battle of St. George's Cay, 1798
Gibraltar - National Day, 1969
Guinea Bissau - Independence Day, 1974

11

Belgium - Queen Paola's Birthday, 1937
Catalonia (Spain) - Flag day (invasion of Barcelona, 1472)
Pakistan - Founder's Death Anniversary, 1948
USA - Patriot Day, 2001 (half staff)

12

Cape Verde - Day of the Nation
Ethiopia - Popular Revolution Day, 1974
Guinea Bissau - Amilcar Cabral's Birthday, 1932

13

Palestine - Israel - PLO Accord, 1993

14

Nicaragua - Battle of San Jacinto Day

15

- Independence Day, 1821
- Costa Rica
- El Salvador
- Guatemala
- Honduras
- Nicaragua
Japan - Respect for the Aged Day
Sweden - 50th Anniversary of H.M. King Carl XVI Gustaf ascension to throne (observed in 2023 only)
USA - POW/MIA Recognition Day (third Friday of September)

16

Mexico - Independence Day, 1810
Papua New Guinea - Independence Day, 1975
Wales - Owain Glyndŵr day

17

Australia - Citizenship Day
The Netherlands - Opening of Parliament (varies, third Tuesday; observe in The Hague only)
USA - Constitution Day