Non–metal oxides  are inorganic chemical compounds formed by  oxygen atoms with atoms of nonmetallic elements . Among these chemical elements are Hydrogen, Carbon, Nitrogen, Phosphorus, Sulfur, Halogens.

As they are considered to be derivatives of the oxyacids, but with a less water molecule, they are also called  anhydrides .

Non-Metal Oxides are the covalent oxides of non metals with oxygen that react with water to produce acids or with bases to produce salts. Hydronium ions (H₃O⁺) are formed when acidic nonmetal oxides react with water to generate oxyacids. The conduct of acidic oxides may be summarised in two broad assertions. SO₃ and dinitrogen pentoxide (DNO) are examples of oxidants (N₂O₅). Acid anhydrides are nonmetals that display one of their most prevalent oxidation values. The oxidation state of the nonmetal does not change when these oxides interact with water to generate oxyacids.

Non-metallic oxides are formed by the reaction of non-metals with oxygen. They react with a base to give salts and water.

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