Jiuzhang

Jiuzhang may refer to:


 * Jiuzhang suanshu, or The Nine Chapters on the Mathematical Art, Chinese mathematics book, composed from the 10th–2nd century BCE
 * Shu shu Jiuzhang, or Mathematical Treatise in Nine Sections, 13th century Chinese mathematical text by Qin Jiushao
 * Jiu Zhang, collection of poems attributed to Qu Yuan
 * Nine Chapter Law, or Jiuzhang Lü, law of the Han dynasty
 * Jiuzhang (quantum computer), a model quantum computer developed by University of Science and Technology of China
 * Zhao Jiuzhang, Chinese scientist