Country observance hub

Thailand observances

4 source-backed records whose verified scope explicitly identifies Thailand. This is an observance index, not a public-holiday calendar.

Country-specific observances

Thailand observance library

Source-backedVariable CustomIn-depth guide

Chiang Mai Yee Peng Festival

23–25 November 2026 (Chiang Mai municipal edition) · Chiang Mai, Thailand / Lanna cultural festival with municipal programming; target-year dates and lantern rules require current local-authority confirmation.

Thai government sources identify Yi Peng as a Lanna full-moon tradition and verify Chiang Mai Municipality/Province programming. The 2026 municipal edition is scheduled for 23–25 November;…

Source-backedFixed AnnualIn-depth guide

Constitution Day

10 December · Thailand

Thailand’s Board of Investment official 2026 holiday information lists 10 December 2026 as Constitution Day.

Source-backedFixed AnnualIn-depth guide

National Father’s Day

5 December every year; 5 December 2026 · Thailand / national observance

Thailand’s Government Public Relations Department states that 5 December, the birthday of the late King Bhumibol Adulyadej The Great, is also observed as Thailand’s National Day and Nationa…

Source-backedFixed AnnualIn-depth guide

National Mother’s Day

12 August every year; 12 August 2026 · Thailand / national important day and annual public holiday

Thailand’s Cabinet confirmed in July 2026 that 12 August every year remains National Mother’s Day, alongside the Birthday Anniversary of Queen Sirikit The Queen Mother, and remains an annua…