Guoyu or Guo Yu may refer to:
國語
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Standard Chinese, a standardized variety of spoken Mandarin Chinese usually called Putonghua in mainland China
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Taiwanese Mandarin, the related standardized variety of Mandarin in Taiwan
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Guoyu (book), a classical history book of ancient China
People
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Guoyu (name)
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Cheng Rui (died 903), Tang dynasty warlord known as Guo Yu at one point
