Supercritical may refer to:
- Critical mass, the smallest amount of fissile material needed for a sustained nuclear chain reaction
- Critical temperature, Tc, the temperature above which distinct liquid and gas phases do not exist
- Supercritical fluid, a substance at a temperature and pressure above its thermodynamic critical point
- Supercritical carbon dioxide, same as above, applied to carbon dioxide
- Supercritical fluid chromatography, high performance liquid chromatography (HPLC), using supercritical carbon dioxide as the mobile phase
- Supercritical airfoil, an airfoil designed to delay the onset of wave drag in the transonic speed range
- Supercritical drying, the process to remove liquid in a precisely controlled way, similar to freeze drying
- Supercritical mass, where there is an increasing rate of fission
- Supercritical water reactor (SCWR), a Generation IV nuclear reactor concept that uses supercritical water as the working fluid
- Supercritical water oxidation or SCWO, a process that occurs in water at temperatures and pressures above a mixture's thermodynamic critical point
- Supercritical flow, when the flow velocity is larger than the wave velocity
- Supercritical steam generators, a steam generator operating above the critical point of water, hence having no water - steam separation
- Hopf bifurcation, a local bifurcation ; when the first Lyapunov coefficient is negative, the bifurcation is called supercritical
- Pitchfork bifurcation, similar to the case of a Hopf bifurcation