List of organs of the human body
This article contains a list of organs in the human body. It is widely believed that there are 78 organs ; however, there is no universal standard definition of what constitutes an organ, and some tissue groups' status as one is debated. Since there is no single standard definition of what constitutes an organ, the number of organs vary depending on how one defines an organ. For example, this list contains more than 78 organs.
The list below is not comprehensive, as it is still not clear which definition of an organ is used for all the organs in the list.
Organ related tables
| Level | Definition |
| Organ systems | A biological system consisting of a group of organs that work together to perform one or more functions. |
| Organ sub-systems | A biological system consisting of a group of organs that work together to perform just one function. |
| Body parts | Somewhat arbitrarily defined sections on the body based on what humans have historically thought was one thing with a primary function. |
| Organs | A collection of tissues that structurally form a functional unit specialized to perform a particular function. |
| Organ parts | The different sections that medical professionals tend to split a given organ into for medical purposes. |
| Tissue | Consists of a group of structurally and functionally similar cells as well as their intercellular material. |
| Cells | Organells enclosed in a membrane. |