辐射化学（英语：Radiation chemistry）为核化学的一部分，是一门研究辐射能作用于物体上产生的化学作用的学科；这与放射化学完全不同，因为经辐射被化学改变的物质不需要表现出放射性。其中一个例子就是将水转变为氢气与过氧化氢。

Radiation chemistry is a subdivision of nuclear chemistry which is the study of the chemical effects of radiation on matter; this is very different from radiochemistry as no radioactivity needs to be present in the material which is being chemically changed by the radiation. An example is the conversion of water into hydrogen gas and hydrogen peroxide.