Phosphorus oxide can refer to:
- Phosphorus pentoxide (phosphorus(V) oxide, phosphoric anhydride), P2O5
- Phosphorus trioxide (phosphorus(III) oxide, phosphorous anhydride), P2O3
- Phosphorus tetroxide, P2O4
- Several other, less common, oxides of phosphorus, including P4O7, P4O9, and P2O6
Gases:
- Phosphorus monoxide, PO
- Phosphorus dioxide, PO2
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