Ratu usually refers to a title used by Fijians of chiefly rank, and also to Javanese word to refer the leaders, especially kings or nobles. Ratu is also a word from both the Malay and Indonesian languages which means "queen". Also Balinese ratu ‘king’, Wayan rātū ‘head of a clan, the title given to one who has been installed as chief’, Samoan lātū ‘person in charge of an undertaking, e.g. a party of builders, or, in the case of women, a weaving bee’. Most reflexes of *datu in the Philippines and western Indonesia contain a vocative marker *-q (Blust 1979).

Ratu may also refer to:

• Michael Ratu, a professional rugby league footballer who plays for Leeds Rhinos
• Pangeran Ratu, the ruler of Banten in Northwest Java, Indonesia
• Ratu Nasiganiyavi, an Australian winger for the NSW Waratahs rugby union club
• Ratu Bagus, a guru

• Pelabuhan Ratu, an isolated fishing village at the south coast of West Java
• Ratu block, one of the twenty administrative blocks of Ranchi district, Jharkhand state, India
• Ratu, Ranchi, census town in Ranchi district, Jharkhand, India
• Ratu Boko, an archaeological site in Java
• Ratu Cakobau Park, a rugby union stadium in Nausori, Fiji
• Ratu Plaza, a shopping mall located in Central Jakarta, Indonesia
• Ratu, a village in Nepal
• Râtu River, another name for the Hopârta River in Romania

• Ratu (band), an Indonesian female duo formed in 1999 and disbanded in 2007
• Ratu - Satu Penghargaan, a greatest hits album by Malaysian singer Ziana Zain
• Ratu Kadavulevu School, a school in Lodoni, Fiji

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