The smallest organ in the human body is the cochlea, which is found in the inner ear. The cochlea resembles a snail shell and is responsible for converting sound vibrations into nerve impulses that are sent to the brain. This tiny, spiral-shaped structure plays a crucial role in our ability to hear and is essential for balance as well. While commonly considered an organ, it is notably small compared to others, underscoring the complexity of the body's various systems that function together seamlessly.