A cavity is a hole. It may refer to:
- Dental cavity, damage to the structure of teeth
- Resonator, a device designed to select for waves of particular wavelengths
- Cavitation, the phenomenon of partial vacuums forming in fluid, for example, in propellors
- Cavitary pneumonia, a type of pneumonia in which a hole is formed in the lung
- Cavity sludge metal band from Miami, Florida.
- Cavity hip hip artist from Santa Rosa, Ca The Bay Area