| Suddha Dibyaratana | |||||
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| Princess of Rattanakosin | |||||
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| Born | 14 September 1877 Grand Palace Bangkok, Siam | ||||
| Died | 2 January 1922 (aged 44) Bangkok, Siam | ||||
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| House | Chakri dynasty | ||||
| Father | Chulalongkorn (Rama V) | ||||
| Mother | Queen Sukhumala Marasri | ||||
Suddha Dibyaratana, Princess of Rattanakosin (Thai: สุทธาทิพยรัตน์; RTGS: Sutthathipphayarat; 14 September 1877 – 2 January 1922), was the Princess of Siam (later Thailand). She was a member of the Siamese royal family. She was given the highest rank of any daughter of Chulalongkorn, King Rama V of Siam.
Her mother was Queen Sukhumala Marasri, fourth Queen Consort and half-sister of King Chulalongkorn. She had a younger brother, Paribatra Sukhumbandhu, the Prince of Nakhon Sawan. Her full given name was Suddha Dibyaratana Sukhumkhattiya Galyavadi (Thai: สุทธาทิพยรัตน์ สุขุมขัตติยกัลยาวดี. She was, if not, one of the most beautiful princesses out of all the King's daughters.
On 9 August 1906, she was given the royal title of The Princess of Rattanakosin, translated in Thai as Krommaluang Si Rattanakosin (Thai: กรมหลวงศรีรัตนโกสินทร). She was the only daughter given the rank of Krommaluang, the 3rd level of the Krom ranks.