Ratu Biru (Thai: รายาบีรู; Malay: راتو بيرو) ruled the Sultanate of Patani (1616–1624), succeeding her sister Ratu Hijau. She was the second of three daughters of Sultan Mansur Shah who ruled the country. She was succeeded by her sister Ratu Ungu. In Malay, her name means "Blue" or "Blue Queen."
- A. Teeuw & D. K. Wyatt. Hikayat Patani: The Story of Patani. Bibliotheca Indonesica, 5. The Hague: Martinus Nijhoff, 1970.
- Ahmad Fathy al-Fatani. Pengantar Sejarah Patani. Alor Setar: Pustaka Darussalam, 1994.
- Wayne A. Bougas. The Kingdom of Patani: Between Thai and Malay Mandalas. Occasional Paper on the Malay World, no. 12. Selangor: Institut Alam dan Tamadun Melayu, Universiti Kebangsaan Malaysia, 1994.
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