氯化镭，化学式RaCl₂，是第一种被制出的镭化合物，由玛丽·居里制得。金属镭最初由汞电极电解氯化镭溶液制得。

氯化镭在溶液中结晶生成二水合物(RaCl₂·2H₂O)。在空气中100°C加热一小时，然后再在氩气氛、520°C中加热5.5小时可使氯化镭水合物脱水。若存在其它阴离子，在氯化氢气体中熔融可使氯化镭脱水。

Radium chloride (RaCl₂) is a chemical compound of radium and chlorine, and the first radium compound isolated in a pure state. Marie Curie and André-Louis Debierne used it in their original separation of radium from barium. The first preparation of radium metal was by the electrolysis of a solution of this salt using a mercury cathode.