* Cryobiology, the branch of biology that studies the effects of low temperatures on living things
* Cryonics, the low-temperature preservation of people who cannot be sustained by contemporary medicine
* Cryoprecipitate, a blood-derived protein product used to treat some bleeding disorders
* Cryotherapy, medical treatment using cold
** Cryoablation, tissue removal using cold
** Cryosurgery, surgery using cold
* Cryo-electron microscopy (cryoEM), a technique that fires beams of electrons at proteins that have been frozen in solution, to deduce the biomolecules’ structure