Thu Thiri Myatswa Ratana Devi (Burmese: သုသီရိမြတ်စွာရတနာဒေဝီ, Pali: Susīrimratswāratanādevi), commonly known as the Princess of Salin (Burmese: စလင်းမင်းသမီး) or Salin Supaya (Burmese: စလင်းစုဖုရား, pronounced [səlɪ́ɰ̃ sṵpʰəjá]),[note 1] was the Tabindaing princess (chief queen designate) during the late Konbaung dynasty.

[3] As a favourite daughter of King Mindon and one who was proficient in mathematics, she served as head of the royal treasury (the equivalent of HM Treasury) during the reign of King Mindon.

She was adopted by the Queen of the Northern Palace, Khin The, who was the half-sister of Limban Mibaya.

The person designated is sequestered in a separate palace and expected to be the chief queen when the heir apparent eventually ascends the throne.

[7] In the end, however, Salin Supaya did not become Chief Queen as King Thibaw married Supayalat and her elder sister Supayagyi.