Xun Zi (simplified Chinese: 荀子; traditional Chinese: 荀子; pinyin: Xún Zǐ; Wade-Giles: Hsün Tzu, ca. 312–230 BC) was a Chinese Confucian philosopher who lived during the Warring States Period and contributed to one of the Hundred Schools of Thought. Xun Zi believed man's inborn tendencies need to be curbed through education and ritual, counter to Mencius's view that man is innately good. He believed that ethical norms had been invented to rectify mankind.

Educated in the state of Qi, Xun Zi was associated with the Confucian school, but his philosophy has a pragmatic flavour compared to Confucian optimism. Some scholars attribute it to the divisive times.

Xunzi was one of the most sophisticated thinkers of his time, and was the teacher of Li Si and Han Fei Zi.