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No. 174 / 195Flag of Thailand
Capital
Bangkok
Continent
Asia
Flag adopted
1917(r1)
Designer
Not individually credited

Thailand

What the source says

Referenced, awaiting primary-source review
The design was adopted on 28 September 1917, according to the royal decree issued by Rama VI. Red for the land and people; white for religions; blue for the monarchy, the last having been the auspicious colour of Rama VI. In 1917, the middle colour was changed to dark blue [...] also chosen to show solidarity with the Allies of World War I.
(r1) Flag of Thailand (Wikipedia (English)), read on 2026-07-17. States the adoption year, which colors the flag has, what the colors mean and the symbolism and history on this page.

Referenced, not verified: a secondary work states this, and the document that constitutes the flag has not been read for this entry. What the marks mean.

Colors and meaning

  • Red(r1) #A51931

    The land and people(r1)

  • White(r1) #F4F5F8

    Religion(r1)

  • Blue(r1) #2D2A4A

    The monarchy (the auspicious colour of Rama VI)(r1)

Symbolism and history(r1)

Five horizontal bands of red, white, blue, white and red, the central blue band twice as wide as each of the others, adopted on 28 September 1917 by royal decree of Rama VI; some sources say the blue was also chosen to show solidarity with the Allies of the First World War.

Most similar flags

The 6 closest of the 194 other national flags, ranked by a similarity index computed from the flag images themselves. The number is that index, 0–100 — not a claim that the two flags are “X% identical”.

Computed at build time: each flag is rasterised to 64x48, and the score is 0.55 × colour overlap + 0.45 × structure. A different weighting would rank these differently. How the index works.

References — not verification

Further reading: Flag of Thailand on Wikipedia

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