Flag Days of September

Last modified: 2025-09-06 by rob raeside
Keywords: flag days |
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Months of the Year

January | February | March | April | May | June | July | August | September | October | November | December | Other

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

See also:

• Flag Days of the World (main page)

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 
• 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)

[4]

5

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

6

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

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

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)
• USA; Delaware, Oklahoma, Virginia - Freedom Flag, Official Flag of Remembrance for 9/11

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
• USA - POW/MIA Recognition Day  (third Friday of September)

16

• Malaysia - Malaysia Day
• 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
• Vatican - Name Day (St. Robert Bellarmine)

18

• Chile - Independence Day, 1810
• USA - Air Force's Birthday

19

• Luxembourg - Liberaton Day, 1944
• St. Kitts and Nevis - Independence Day, 1983

[20]

21

• Armenia - Independence Day, 1991
• Belize - Independence Day, 1981
• Malta - Independence Day, 1964
• United Nations - International Day of Peace
• Gloucestershire, England - Gloucestershire Day

22

• Derbyshire, England - Derbyshire Day
• Mali - Independence Day, 1960

23

• Japan - Autumnal Equinox Day
• Saudi Arabia - Foundation of the Kingdom, 1932

24

• Guinea Bissau - Independence Day
• South Africa - Heritage Day
• Trinidad and Tobago - Republic Day, 1978
• USA - Gold Star Mothers Day  (last Sunday of September)

25

• Cape Verde
  by Željko Heimer
  - Flag Day, 1992
• Monmouthshire, Wales - St. Cadoc's Day
• Mozambique - Revolution Day, 1964
• Rwanda - Establishment of Republic Day, 1973

26

• Liechtenstein - Constitution Day, 1862
• Yemen - Revolution Day, 1962

27

• Islamic World - the Prophet's Birthday 570 (date varies, this is 2023 date)
• Poland - Underground State Day
• Turkmenistan - Independence Day

28

• Taiwan - Teachers' Day
• Thailand
  by Joan-Francés Blanc
  - Flag Day, 1917

29

• Paraguay - Battle of Boqueron, 1866

30

• Botswana - Independence Day, 1966