Constitution Day is a holiday to honor the constitution of a country. Constitution Day is often celebrated on the anniversary of the signing, promulgation or adoption of the constitution, or in some cases, to commemorate the change to constitutional monarchy.
- Abkhazia, November 26 (1994). See Constitution of Abkhazia.
- Andorra, March 14 (1993). Known locally as Dia de la Constitució. See Constitution of Andorra.
- Argentina, May 1 (1853). See Constitution of Argentina. Not a public holiday.
- Armenia, July 5 (1995). See Constitution of Armenia.
- Australia, July 9 (1900). See Constitution of Australia. Not a public holiday.
- Azerbaijan, November 12 (1995). See Constitution of Azerbaijan. Not a public holiday.
- Belarus, March 15 (1994). Known locally as Dzień Kanstytucyji. See Constitution of Belarus.
- Belgium, July 21 (1890). Known locally as Nationale feestdag van België (in Dutch) and Fête nationale belge (in French).
- Day of the Flemish Community, July 11 (Flemish community only). Known locally as Feestdag van Vlaanderen.
- French Community Holiday, September 27 (French-speaking community only). Known locally as Fête de la Communauté française.
- Wallonia Day, third Sunday of September (Walloon Region only).
- Day of the German-speaking Community of Belgium, November 15 (German-speaking community only). Known locally as Feiertag der Deutschsprachigen Gemeinschaft.
- Brazil, November 15 (1889). Known in Brazil as Dia da Proclamação da República (Republic Day). See Constitution of Brazil. Public holiday.
- Cambodia, September 24 (1993). See Cambodia Constituent Assembly.
- Canada Day, July 1 (1867). Also known as Fête du Canada (in French). See Constitution of Canada.
- China:
- Mainland China, December 4 (1982). See Constitution of the People’s Republic of China.Not a public holiday.
- Cook Islands, August 4 (1965). Known locally as Te Maeva Nui Celebrations. See Politics of the Cook Islands.
- Denmark, June 5 (1849, 1953). Known locally as Grundlovsdag. See Constitution of Denmark.
- Dominican Republic, November 6 (1844). See History of the Dominican Republic.
- Ethiopia, July 16 (1931). See 1931 Constitution of Ethiopia.
- Faroe Islands, June 5 (1849, 1953). Known locally as Grundlovsdag. See Constitution of Denmark.
- Federated States of Micronesia, May 10 (1979).
- Fiji, September 7 (2013). First observed in 2016. See 2013 Constitution of Fiji.
- Finland, July 17 (1919). The first Constitution of Finland, Constitution Act was enacted at that day and Finland became definitively a republic. Not a public holiday like the national day of Finland, Independence Day, December 6 (1917).
- Germany, May 23 (1949).Constitution Day
- Ghana, January 7 (2019). See Constitution of Ghana.
- India, November 26 (1949). Indian Constitution was adopted by the Constituent Assembly on 26 November. Celebrated all over India. Known locally as Samvidhan Divas. Not a public holiday.
- Indonesia, August 18 (1945). See Constitution of Indonesia. Not a public holiday.
- Ireland, December 29 (1937). See Constitution of Ireland. Not a public holiday.
- Italy, January 1 (1948). See Constitution of Italy.
- Japan, May 3 (1947). See Constitution of Japan.
- Kazakhstan, August 30 (1995). See Constitution of Kazakhstan.
- Korea:
- North Korea, December 27 (1972). See Constitution of North Korea.
- South Korea, July 17 (1948). See Constitution of South Korea.
- Kyrgyzstan, May 5 (1993). See Constitution of Kyrgyzstan.
- Latvia, May 1 (1920). Day of Inauguration of the Constitutional Assembly of Latvia. See Constitution of Latvia.
- Lithuania, October 25 (1992). See Constitution of Lithuania.
- Marshall Islands, May 1 (1979). See Compact of Free Association.
- Maldives, December 22 (1932).
- Mexico, February 5 (1917). Known locally as Día de la Constitución. See Constitution of Mexico. Public holiday for Constitution Day is first Monday of February.
- Mongolia, January 13 (1924). See Constitution of Mongolia.
- Netherlands, December 15 (1954). Known locally as Koninkrijksdag. See Constitution of the Netherlands. Not a public holiday.
- Niue, October 19 (1974). See Niue Constitution Act.
- Norway, May 17 (1814). Known locally as Syttande mai. See Constitution of Norway.
- Pakistan, March 23 (1973). See Constitution of Pakistan.
- Palau, July 9 (1980). See Constitution of Palau.
- Philippines, February 2 (1987). See the 1987 Constitution. Known locally as Araw ng Saligang Batas (in Filipino). First observed in 2002.
- Poland, May 3 (1791). Known locally as Święto Konstytucji 3 Maja. See Constitution of 3 May 1791.
- Puerto Rico, July 25 (1952). Known locally as Día de la Constitución del Estado Libre Asociado. Also commemorated as Occupation Day (1898). See Constitution of Puerto Rico.
- Romania, December 8 (1991). See Constitution of Romania. Not a public holiday.
- Russia, December 12 (1993). Has been a working holiday since 2005. See Constitution of Russia.
- Serbia, February 15 (1835). Known locally as Dan državnosti. See Constitution of Serbia.
- Slovakia, September 1 (1992). Known locally as Deň Ústavy Slovenskej republiky. See Constitution of the Slovak Republic.
- Spain, December 6 (1978). Known locally as Día de la Constitución. See Constitution of Spain.
- Sweden, June 6 (1809, 1974). Known locally as Sveriges nationaldag. Also known as the Day of the Swedish flag. See Basic Laws of Sweden.
- Switzerland, September 12 (1848). Adoption of the 1st Federal Constitution. See Swiss Federal Constitution. Not a public holiday.
- Taiwan, December 25 (1947). See Constitution of the Republic of China. Not a public holiday.
- Tajikistan, November 6 (1994)
- Thailand, December 10 (1932). Known locally as Wan Ratthathammanun. See Constitution of Thailand.
- Turks and Caicos Islands, August 30 (1976).
- Turkmenistan, May 18 (1992)
- Ukraine, June 28 (1996). See Constitution of Ukraine.
- United States, September 17 (1787). See United States Constitution. Not a public holiday.
- Uruguay, July 18 (1830). Known locally as Jura de la Constitución (de la República Oriental del Uruguay). See Constitution of Uruguay.
- Uzbekistan, December 8 (1992). Known locally as Konstitutsiya Kuni (in Uzbek). See Constitution of Uzbekistan.
- Vanuatu, October 5 (1979). See Constitution of Vanuatu.