高氯酸铯是一种无机化合物，属于高氯酸盐，为一种盐类，其化学式为CsClO₄。高氯酸铯能作氧化剂。高氯酸铯是白色吸湿性结晶，容易溶于水和乙醇。

是可溶性最低的碱金属高氯酸盐（其次是铷、钾、锂、和钠），属性可用于分液的目的，甚至重分析。 这种低溶解度发挥了重要作用于为碱金属钫，如高氯酸钫与高氯酸铯。

加热时，当温度高于 250° 时，高氯酸铯会分解为氯化铯。像所有的高氯酸盐，这是一种强氧化剂，可能发生剧烈反应的还原剂和有机物质，特别是在高温下。

Caesium perchlorate, CsClO₄ (also known as cesium perchlorate), is a perchlorate of caesium. It forms white crystals, which are sparingly soluble in cold water and ethanol. It dissolves more easily in hot water.

CsClO₄ is the least soluble of the alkali metal perchlorates (followed by Rb, K, Li, and Na), a property which may be used for separatory purposes and even for gravimetric analysis. This low solubility played an important role in the characterization of francium as an alkali metal, as francium perchlorate coprecipitates with caesium perchlorate.