Constitution Day2026 · Date · History
Thailand’s Board of Investment official 2026 holiday information lists 10 December 2026 as Constitution Day.
About Constitution Day
Thailand marks Constitution Day on December 10. The Bank of Thailand includes the date on its 2026 financial-institution holiday list, and the Public Relations Department identifies it as a national civic holiday.
The occasion recalls the December 10, 1932 promulgation of Siam’s first permanent constitution, not the earlier June 1932 provisional constitution or every later constitutional revision.
Why Constitution Day matters
The day invites reflection on constitutional governance, rights and civic institutions in Thailand.
Constitution Day’s historical meaning can be discussed without assuming that all political viewpoints or all institutional closures are uniform.
History of Constitution Day
Following the June 1932 constitutional transition, a temporary charter preceded the permanent constitution promulgated on December 10, 1932.
Thailand’s parliamentary museum traces earlier double commemorations in June and December and later December-only practice. Government sources now identify December 10 as Constitution Day.
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
7 fields not established in reviewed sources
Also known as
Constitution Day in Thailand
How to Observe Constitution Day
Read an impartial historical account of Thailand’s 1932 constitutional transition.
Consult official state and financial-institution holiday notices when planning travel or services.
Distinguish the 1932 permanent charter from later constitutions and changes.
Discuss constitutional questions respectfully and avoid treating historical interpretations as unanimous.
Constitution Day Facts
Date: December 10 in Thailand.
Commemorates the first permanent Siamese constitution of December 10, 1932.
Earlier provisional charter dates to June 1932.
Bank of Thailand lists December 10 as a 2026 holiday for financial institutions.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
- Remembrance Civic Context Care.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
Bank of Thailand — Financial Institutions Holiday (2026) (opens in a new tab)
Primary Institutional Evidence
Thai Parliamentary Museum — History of Constitution Day (opens in a new tab)
Primary Institutional Evidence
Thailand Government Public Relations Department — Constitution Day history (opens in a new tab)
Primary Institutional Evidence
Thailand Board of Investment — social and culture / holidays (opens in a new tab)
Government First Party
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is Constitution Day?
10 December The documented recurrence rule is: 10 December.
Does Constitution Day fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is Constitution Day an official public holiday?
The reviewed sources verify it within this scope: Thailand. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes Constitution Day?
The documented basis is: Thailand’s Board of Investment official 2026 holiday information lists 10 December 2026 as Constitution Day.. Supporting evidence includes Thailand Board of Investment — social and culture / holidays. The site does not infer a separate creator or founder unless reviewed evidence establishes one.
Is Constitution Day international or country-specific?
This observance is specific to Thailand. Its fuller verified scope is: Thailand.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-10-08.
When is Thailand Constitution Day?
December 10 every year.
What happened on December 10, 1932?
Siam’s first permanent constitution was promulgated.
Was that Thailand’s first constitutional document?
A provisional charter was issued earlier in June 1932; December marks the permanent constitution.
Are all workplaces closed?
Official and financial-institution calendars identify the holiday, but private workplaces should check the rules applicable to them.
Other observances on December 10
These observances are also listed on December 10, 2026.
Human Rights Day
A/RES/423 (V)
International Animal Rights Day
World Animal Protection states that International Animal Rights Day is observed on December 10 every year and is used to advocate for recognition and protection of animals as sentient being…
Nobel Day
The Nobel Foundation identifies 10 December as Nobel Day, when the Nobel Prize award ceremonies take place in Oslo and Stockholm
Victory Day
Iraq's Ministry of Higher Education and Scientific Research publishes annual Victory Day messages on December 10 commemorating victory over terrorism/ISIS.