The wuxing (五行), also known as the Five Elements or Five Phases, is the short form of "wǔ zhǒng liúxíng zhī qì" (五種流行之氣) or "the five types of chi dominating at different times". It is a fivefold conceptual scheme that many traditional Chinese fields used to explain a wide array of phenomena, from cosmic cycles to the interaction between internal organs, and from the succession of political regimes to the properties of medicinal drugs.

The "Five Phases" are Fire (火 huǒ), Water (水 shuǐ), Wood (木 mù), Metal (金 jīn), and Earth (土 tǔ).

The system of five phases was used for describing interactions and relationships between phenomena. After it came to maturity in the second or first century BCE during the Han dynasty, this device was employed in many fields of early Chinese thought, including seemingly disparate fields such as geomancy or feng shui, astrology, traditional Chinese medicine, music, military strategy, and martial arts. The system is still used as a reference in some forms of complementary and alternative medicine and martial arts.