Prince Sommatiwongse Varodaya, The Prince of Nakhon Si Thammarat (Thai: สมมุติวงศ์วโรทัย; RTGS: Sommuttiwong Warothai) was the Prince of Siam (later Thailand).

He was a member of the Siamese royal family and a son of King Chulalongkorn Rama V of Siam.

His mother was Queen Savang Vadhana, a daughter of King Mongkut (thus his father's half-sister) and Princess Piyamavadi Prince Sommatiwongse Varodaya died on 17 June 1899 at the age 17.

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