脱氢是一种化工单元过程，是氢化的相反过程，是减少有机物分子中的氢原子数目的过程，一般有两种方法：

脱氢主要用于将丁烷脱氢形成丁二烯作为合成腈纶或合成橡胶的原料；将异戊烯脱氢形成异戊二烯作为合成橡胶原料；将乙苯脱氢成为苯乙烯做合成树脂、合成纤维的原料等；将甲醇直接氧化成甲醛也是一种脱氢过程。

Dehydrogenation is a chemical reaction that involves the removal of hydrogen from a molecule. It is the reverse process of hydrogenation. Dehydrogenation reactions are conducted both on industrial and laboratory scales. Dehydrogenation converts saturated fats to unsaturated fats. Enzymes that catalyze dehydrogenation are called dehydrogenases. Dehydrogenation processes are used extensively to produce styrene in the fine chemicals, oleochemicals, petrochemicals, and detergents industries.