Guoyu

Guoyu or Guo Yu may refer to:

國語

 * Standard Chinese, a standardized variety of spoken Mandarin Chinese usually called Putonghua in Mainland China
 * Taiwanese Mandarin, the related standardized variety of Mandarin in Taiwan
 * Guoyu (book), a classical history book of ancient China

People

 * Guoyu (name)
 * Cheng Rui (died 903), Tang dynasty warlord known as Guo Yu at one point