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, P4O8, P4O9, and P2O6
 
Gases:
- Phosphorus monoxide, PO
 - Phosphorus dioxide, PO2
 
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