Cavity

Cavity may refer to:

Biology and healthcare

 * Body cavity, a fluid-filled space in many animals where organs typically develop
 * Gastrovascular cavity, the primary organ of digestion and circulation in cnidarians and flatworms
 * Dental cavity or tooth decay, damage to the structure of a tooth
 * Lung cavity, an air-filled space within the lung
 * Nasal cavity, a large, air-filled space above and behind the nose in the middle of the face

Radio frequency resonance

 * Microwave cavity or RF cavity, a cavity resonator in the radio frequency range, for example used in particle accelerators
 * Optical cavity, the cavity resonator of a laser
 * Resonant cavity, a device designed to select for waves of particular wavelengths

Other uses

 * Cavity (band), a sludge metal band from Miami, Florida
 * Cavity method, a mathematical method to solve some mean field type of models
 * Cavity wall, a wall consisting of two skins with a cavity