Hydrogen (disambiguation)

Hydrogen is the chemical element with symbol H and atomic number 1.

Hydrogen may also refer to:
 * Dihydrogen, an allotrope of hydrogen
 * Hydrogen atom, about the physics of atomic hydrogen
 * Hydrogen ion
 * Hydron (chemistry), a.k.a. "proton" or "hydrogen"
 * Isotopes of hydrogen
 * Hydrogen-2 (deuterium)
 * Hydrogen-3 (tritium)
 * Hydrogen-4
 * Hydrogen-5

Other things named "hydrogen"

 * Hydrogen (horse), a champion Australian Thoroughbred racehorse
 * Hydrogen (software), drum machine software