氯化铯是一种无机盐，分子式为CsCl。氯化铯型结构是一种很重要的晶体结构。

氯化铯可通过氢氧化铯或碳酸铯与盐酸反应并重结晶提纯制得。

1. CsOH + HCl → CsCl + H₂O
2. Cs₂CO₃ + 2 HCl → 2 CsCl + 2 H₂O + CO₂

Caesium chloride or cesium chloride, is the inorganic compound with the formula CsCl. This colorless solid is an important source of caesium ions in a variety of niche applications. Its crystal structure forms a major structural type where each caesium ion is coordinated by 8 chlorine ions. Caesium chloride dissolves in water. Caesium chloride occurs naturally as impurities in carnallite (up to 0.002%), sylvite and kainite. Less than 20 tonnes of CsCl is produced annually worldwide, mostly from a caesium-bearing mineral pollucite.