Paschen

Paschen may refer to:


 * Friedrich Paschen (1865–1947), German physicist
 * Paschen (crater), a lunar crater on the far side of the Moon
 * Paschen-Back effect, the splitting of atomic energy levels in the presence of a strong magnetic field
 * Paschen series, a Hydrogen spectral series in the infrared band
 * Paschen's law, an equation that gives the breakdown voltage, that is the voltage necessary to start a discharge or electric arc, between two electrodes in a gas as a function of pressure and gap length