氯酸钠（化学式：NaClO₃）是一种氧化剂，为白色晶体，可溶于水。

加热熔融300℃以上分解，放出氧气，为强氧化剂；对热不稳定，易潮解；与磷、硫及有机物相混，遇热、摩擦或撞击，容易引起燃烧或爆炸，有毒。

通常为白色或微黄色等轴晶体，晶体有旋光性，相对分子质量106.44。味咸而凉，易溶于水、微溶于乙醇，水溶液呈中性。在酸性溶液中有强氧化性。

Sodium chlorate is an inorganic compound with the chemical formula NaClO₃. It is a white crystalline powder that is readily soluble in water. It is hygroscopic. It decomposes above 300 °C to release oxygen and leave sodium chloride. Several hundred million tons are produced annually, mainly for applications in bleaching paper.