* Cryogenics, the study of the production and behaviour of materials at very low temperatures and the study of producing extremely low temperatures 
* Cryoelectronics, the study of superconductivity under cryogenic conditions and its applications 
* Cryosphere, those portions of Earth's surface where water ice naturally occurs
* Cryotron, a switch that uses superconductivity
* Cryovolcano, a theoretical type of volcano that erupts volatiles instead of molten rock