HM King Chulalongkorn Memorial Day is a public holiday in Thailand, known locally as วันปิยมหาราช.
In 2026 it falls on Friday 23 October; in 2027 on Saturday 23 October.
The date is fixed, so only the weekday changes from year to year.
Dates, 2025 to 2028
| Year | Date | Weekday | Note |
|---|---|---|---|
| 2025 | 23 October | Thursday | |
| 2026 | 23 October | Friday long weekend | |
| 2027 | 23 October | Saturday weekend | |
| 2028 | 23 October | Monday long weekend |