氧化钠，分子式Na₂O，是钠的正常氧化物，常温下是白色固体。其性质极活泼，为碱性氧化物，与水反应生成氢氧化钠。在空气中加热能生成浅黄色的过氧化钠。

氧化钠可由钠和氧反应制得：

氧化钠也能直接借由燃烧钠而得，但是这样会产生20%的过氧化钠：

将熔融状态的钠金属与硝酸钠反应，也能制取氧化钠：

Sodium oxide (SOX) is a chemical compound with the formula Na₂O. It is used in ceramics and glasses, though not in a raw form. It is the base anhydride of sodium hydroxide, so when water is added to sodium oxide NaOH is produced.

The alkali metal oxides M₂O (M = Li, Na, K, Rb) crystallise in the antifluorite structure. In this motif the positions of the anions and cations are reversed relative to their positions in CaF₂, with sodium ions tetrahedrally coordinated to 4 oxide ions and oxide cubically coordinated to 8 sodium ions.