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

Look up hydrogen in Wiktionary, the free dictionary.

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

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

Wikimedia Commons has media related to hydrogen.

• H (disambiguation)
• Hydrogen economy
• Hydrogen vehicle

This disambiguation page lists articles associated with the title Hydrogen.
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