Nitrogen oxide may refer to any of these chemical compounds:
- Nitrous oxide, +1 oxidation state, sweet-smelling anesthetic sometimes called "laughing gas"
- Nitric oxide, +2 oxidation state, used in the body as stimulant
- Nitrogen dioxide, +4 oxidation state, brown choking gas
- Dinitrogen tetroxide, +4 oxidation state, two nitrogen dioxide molecules bonded together
- Dinitrogen pentoxide, +5 oxidation state, made from nitric acid
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