磷化氢，又名膦，分子式：PH₃，一种无色、极毒、有鱼腥臭味的气体。

实验室中可以用白磷与浓氢氧化钾共热制取：

生成的磷化氢往往因为含有联膦（P₂H₄）而会自燃。磷化氢可用铜、汞、银等较不活泼的金属盐溶液吸收：

磷化氢还可通过金属磷化物与水作用得到。例如：

Phosphine (IUPAC name: phosphane) is the compound with the chemical formula PH₃. It is a colorless, flammable, toxic gas. Pure phosphine is odorless, but technical grade samples have a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphane (P₂H₄). With traces of P₂H₄ present, PH₃ is spontaneously flammable in air, burning with a luminous flame. Phosphines are also a group of organophosphorus compounds with the formula R₃P (R = organic derivative). Organophosphines are important in catalysts where they complex to various metal ions; complexes derived from a chiral phosphine can catalyze reactions to give chiral, enantioenriched products.