King Bhumibol's Birthday is one of Thailand's most important national holidays. It is not only the late king's birthday but also officially recognized as Father's Day and, for many years, Thailand's National Day.

When is King Bhumibol's Birthday?

King Bhumibol's Birthday is observed every year on December 5.

The following is the list of King Bhumibol's Birthday from 2020 to 2049.

The History of King Bhumibol's Birthday?

King Bhumibol Adulyadej was born on December 5, 1927, in Cambridge, Massachusetts, USA, and reigned from 1946 to 2016 (70 years, the longest in Thai history)

He is known by the honorific title "King Bhumibol the Great", and was deeply loved for his tireless service to the country, especially his work in rural development, sustainable agriculture, and national reconciliation.

In 1950s–1960s, as King Bhumibol's popularity grew, his birthday began to be marked with public celebrations, including Buddhist rituals, fireworks, and patriotic events.

In the 1970s, the Thai government officially designated December 5 as Father's Day, aligning the king's symbolic role as the "Father of the Nation" with the Western-style family holiday.

Since 1980s, December 5 was recognized as Thailand's National Day, replacing June 24, the date of the 1932 revolution that brought constitutional monarchy. The holiday honored not just his birth but his leadership and contributions to Thai society.

After his death in 2016, December 5 remained a public holiday to commemorate his legacy.