The zàng-fǔ (simplified Chinese: 脏腑; traditional Chinese: 臟腑) organs are functional entities stipulated by Traditional Chinese medicine (TCM). They constitute the centre piece of TCM's general concept of how the human body works. The term zàng (脏) refers to the organs considered to be yin in nature - Heart, Liver, Spleen, Lung, Kidney -, while fǔ (腑) refers to the yang organs - Small Intestine, Large Intestine, Gall Bladder, Urinary Bladder, Stomach and Sānjiaō. Each zàng is paired with a fǔ, and each pair is assigned to one of the Wǔ Xíng. The zàng-fǔ are also connected to the twelve standard meridians - each yang meridian is attached to a fǔ organ and each yin meridian is attached to a zàng.They are five system of Heart, Liver, Spleen, Lung, Kidney
To highlight the fact that the zàng-fǔ are not equivalent to the anatomical organs, their names are often capitalized.

To understand the zàng-fǔ it is important to realize that their concept did not primarily develop out of anatomical considerations. The need to describe and systematize the bodily functions was more significant to ancient Chinese physicians than opening up a dead body and seeing what morphological structures there actually were. Thus, the zàng-fǔ are functional entities first and foremost, and only loosely tied to (rudimentary) anatomical assumptions.