thumb|[[President of Italy|President Carlo Azeglio Ciampi honors the flag of Cispadane Republic, first Italian flag, during the Tricolour Day on 7 January 2004 in Reggio Emilia.]]
A flag day is a flag-related holiday, a day designated for flying a certain flag (such as a national flag) or a day set aside to celebrate a historical event such as a nation's adoption of its flag.
Flag days are usually codified in national statutes passed by legislative bodies or parliaments; however, in some countries a decree or proclamation by the head of state or chief executive can also order a flag day. The statute, or the proclamation or decree, may specify locations where flags are to be flown and how (for example, at full- or half-staff); alternatively, custom may prevail. The flag day is naturally a flag-flying day.
Specific flag days
Nations that are not broadly recognized sovereign states are shown in pink. Defunct states are highlighted in light grey.
{|class="wikitable sortable"
!State
!Subdivision
!Date<!-- To sort properly needs a data-sort-value in the form mm/dd that matches the date, or is close if the date moves -->
!width=50% class="unsortable"|Notes
|- style="background:#ffe9e6"
| colspan="2"|||data-sort-value="07/23"|July 23||Republic Flag Day
|- style="background:#e0e0e0"
|colspan="2"|||data-sort-value="07/99"|Asad 7||National Flag’s Day. Asad corresponds to July – August.
|-
|colspan="2"|||data-sort-value="11/28"|November 28||Independence Day
|-
|colspan="2"|||data-sort-value="06/20"|June 20||National Flag Day. Anniversary of the death of Manuel Belgrano, who created the current flag
|-
|colspan="2"|||data-sort-value="06/15"|June 15||Commemorates the day the law on the flag was passed, on June 15, 2006
|-
|colspan="2"|||data-sort-value="09/03"|September 3||Commemorates the day the flag was first flown, on September 3, 1901
|-
|colspan="2"|||data-sort-value="11/09"|November 9||State Flag Day
|-
| colspan="2" |
|March 2
|National Flag Day. Commemorates the first hoisting of the national flag in 1971.
|-
|colspan="2"|||data-sort-value="05/10"|Second Sunday of May||Day of the National Emblem and the National Flag (May , . For the next year, the date will be on April , )
|-
|colspan="2"|||data-sort-value="08/17"|August 17||Commemorates the creation of the Bolivian flag by law on August 17, 1825
|-
|||||data-sort-value="09/15"|September 15||Day of Serb Unity, Freedom and the National Flag, celebrated with Serbia
|-
|colspan="2"|||data-sort-value="11/19"|November 19||
|-
|colspan="2"|||data-sort-value="02/15"|February 15||National Flag of Canada Day
|-
|rowspan="4"|||||data-sort-value="05/21"|May 21||
|-
|||data-sort-value="01/21"|January 21||
|-
|||data-sort-value="09/22"|September 22||
|-
|||data-sort-value="09/25"|September 25|| Commemorates the first flag-raising at the University of Sudbury on September 25, 1975
|-
|colspan="2"|||data-sort-value="07/09"|July 9||Commemorates the Battle of La Concepción in 1882
|-
|||||data-sort-value="09/21"|September 21||Commemorates the beginning of the Chilean takeover of the Strait of Magellan and Western Patagonia
|-
|colspan="2"|||data-sort-value="08/07"|August 7||Commemorates the Battle of Boyacá on August 7, 1819 and the creation of the Colombian flag on August 7, 1834
|-
| colspan="2" |
|June 5
|Commemorates the inauguration of Josip Jelačić as Ban of Croatia on June 5, 1848
|-
|colspan="2"|||data-sort-value="09/05"|September 5||Commemorates Danish veterans
|-
|rowspan="2"|||||data-sort-value="04/25"|April 25||Commemorates the recognition of the flag by the British government on April 25, 1940
|-
|||data-sort-value="01/26"|January 26, 2025||Unofficial flag day celebrated in 2025. No official flag day.
|-
|colspan="2"|||data-sort-value="09/26"|September 26||Commemorates the adoption of the Ecuadorian flag on September 26, 1860
|-
|colspan="2"|||data-sort-value="06/04"|June 4||
|-
|colspan="2"|||data-sort-value="10/11"|First Monday of Tikimt||Ethiopian month of Tikmit corresponds to October 11 – November 9
|-
|colspan="2"|||data-sort-value="06/99"|Midsummer's Day||
|-
|||||data-sort-value="04/99"|Last Sunday of April||April , . For the next year, the date will be on April ,
|-
|colspan="2"|||data-sort-value="01/14"|January 14||Georgian State Flag Day
|-
|colspan="2"|||data-sort-value="10/27"|October 27||Day before Ohi Day
|-
|colspan="2"|||data-sort-value="05/18"|May 18||Haitian Flag Day
|-
|colspan="2"|||data-sort-value="09/01"|September 1||June 14 before 1995
|-
|colspan="2"|||data-sort-value="03/16"|March 16||Commemorates the establishment of the Hungarian Home Guard on 16 March 1848
|-
|colspan="2" rowspan="2"|||data-sort-value="07/22"|July 22||National Flag Adoption Day
|-
|data-sort-value="12/07"|December 7||Armed Forces Flag Day
|- style="background:#e0e0e0"
|||||data-sort-value="06/07"|June 7||State Flag Day
|-
|colspan="2"|||data-sort-value="01/07"|January 7||Tricolour Day
|-
|||||data-sort-value="12/17"|December 17||
|-
|colspan="2"|||data-sort-value="04/16"|April 16|| Commemorates the first flag-raising on April 16, 1928
|-
| colspan="2" |||data-sort-value="03/03"|March 3||National Flag Day of the Kyrgyz Republic
|-
|colspan="2"|||data-sort-value="11/21"|November 21||Commemorates the first flag-raising on November 21, 1943
|-
|colspan="2"|||data-sort-value="08/24"|August 24||
|-
|colspan="2"|||data-sort-value="01/01"|January 1||
|-
|colspan="2"|||data-sort-value="02/24"|February 24||Flag Day in Mexico
|-
|||||data-sort-value="12/20"|December 20||Commemorates day of state admission. Celebrated since 2023
|-
|colspan="2"|||data-sort-value="04/27"|April 27||
|-
|colspan="2"|||data-sort-value="07/10"|July 10||Mongolian State Flag Day
|-
|colspan="2"|||data-sort-value="12/16"|Poush 1||Commemorates adoption on December 16, 1962 (Poush 1, 2019 in the Nepali calendar). Celebrated since 2017
|-
|rowspan="4"|||||data-sort-value="03/18"|March 18||National Anthem and Flag Day
|-
|||data-sort-value="09/06"|September 6||
|-
|||data-sort-value="07/02"|July 2||
|-
|||data-sort-value="06/13"|June 13||Commemorates the adoption of the flag on June 13, 1985
|-
|||||data-sort-value="10/22"|October 22||
|-
|colspan="2"|||data-sort-value="05/15"|May 15||Unofficial
|- style="background:#ffe9e6"
| colspan="2"|||data-sort-value="09/30"|September 30||Commemorates the first time the flag was flown outside the Headquarters of the United Nations on September 30, 2015
|-
|colspan="2"|||data-sort-value="11/04"|November 4||
|-
|colspan="2"|||data-sort-value="08/14"|August 14||
|-
|colspan="2"|||data-sort-value="06/07"|June 7||Commemorates the Battle of Arica
|-
|colspan="2"|||data-sort-value="05/28"|May 28||Commemorates its first usage after the Battle of Alapan. Since 1994, the celebratory period is May 28 to June 12
|-
|colspan="2"|||data-sort-value="05/02"|May 2||Polish National Flag Day
|-
|colspan="2"|||data-sort-value="12/01"|December 1||Flag Day. In the same day of the celebration of the Restoration of Independence of Portugal on the December, 1, 1640
|-
|colspan="2"|||data-sort-value="06/26"|June 26||
|-
|colspan="2" |||data-sort-value="08/22"|August 22||
|-
| rowspan="5"|||style="background:#ffe9e6"|||data-sort-value="10/25" style="background:#ffe9e6"|October 25||style="background:#ffe9e6"|
|-
|||data-sort-value="02/25"|February 25||Commemorates adoption of the flag on February 25, 1992
|-
| Pskov Oblast||data-sort-value="02/20"|February 20||Commemorates inclusion into the State Heraldic Register of the Russian Federation on February 20, 2019. Established 2023.
|-
|||data-sort-value="10/14"|October 14||Commemorates adoption of the flag on October 14, 1992
|-
| Ulyanovsk Oblast||data-sort-value="12/22"|December 22||
|-
|colspan="2"|||data-sort-value="03/11"|March 11||
Saudi Flag Day
|-
|colspan="2"|||data-sort-value="09/15"|September 15||Day of Serb Unity, Freedom and the National Flag, celebrated with Republika Srpska
|-
|colspan="2"|||data-sort-value="10/12"|October 12||Commemorates the adoption of the flag on October 12, 1954
|-
|||||data-sort-value="12/04"|December 4||
|-
|colspan="2"|||data-sort-value="06/02"|June 6||Also celebrated as the National Day of Sweden since 1983
|-
|colspan="2"|||data-sort-value="11/24"|November 24||Celebrated since 2009
|-
|colspan="2"|||data-sort-value="09/28"|September 28||Celebrated since 2017
|-
|colspan="2"|||data-sort-value="05/18"|May 18||State Flag and Constitution Day. Flag Day was originally separate from Constitution Day and celebrated on February 19, until the two holidays were combined in 2017
|-
|colspan="2"||| data-sort-value="08/23" |August 23||Day of the National Flag
|-
||| Crimean Tatars||data-sort-value="06/26"|June 26||
|-
|colspan="2"|||data-sort-value="11/03"|November 3||Flag Day (United Arab Emirates)
|-
|colspan="2"|||data-sort-value="06/14"|June 14||Flag Day (United States)
|-
|rowspan="10"|||||data-sort-value="07/09"|July 9||
|-
|||data-sort-value="04/17"|April 17||Commemorates the date American Samoa first flew the US flag
|-
| Choctaw Nation||data-sort-value="10/16"|October 16||Celebrated since 2021
|-
|||data-sort-value="07/31"|July 31||Celebrated since 1990
|-
|||data-sort-value="03/29"|March 29||
|-
|||data-sort-value="03/09"|March 9||
|-
|||data-sort-value="11/16"|November 16||Celebrated since 1968
|-
|||data-sort-value="04/17"|April 17||Commemorates the day of adoption on April 17, 1905
|-
|||data-sort-value="03/09"|March 9||
|-
|||data-sort-value="05/17"|May 17||Commemorates the adoption of the flag on May 17, 1921
|-
|colspan="2"|||data-sort-value="11/18"|November 18||Commemorates the approval of the flag on November 18, 1991
|-
|colspan="2"|||data-sort-value="08/03"|August 3||Commemorates the first hoisting of the flag on August 3, 1806
|}
See also
- Flag flying day
- National Day
- Republic Day
- Independence Day
- Public holiday