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 Indonesian language 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:

People 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

Places Ratu Agung, a district in Bengkulu, Indonesia Labuhan Ratu, a district in Lampung Province, Indonesia 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

Other 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