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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