三苯基膦，分子式(C₆H₅)₃P，白色固体，是磷化氢的三苯（苯、甲苯、二甲苯）取代物。主要表现为还原性和亲核性。在有机合成中有相当广泛的应用。

实验室制备时一般用格氏试剂与三氯化磷作用而得。

工业生产则采用三氯化磷、氯苯和钠的反应。 三苯基膦具有锥形的分子结构。 令人惊讶的是三苯基膦是有手性的分子。因为三个苯环的位阻效应，苯环的实际排布是呈螺旋状的，就像排风扇的三个叶片。而这是个非常典型的手性结构。 同时由于三苯基膦具有刚性分子结构，比较容易结晶。

Triphenylphosphine (IUPAC name: triphenylphosphane) is a common organophosphorus compound with the formula P(C₆H₅)₃ - often abbreviated to PPh₃ or Ph₃P. It is widely used in the synthesis of organic and organometallic compounds. PPh₃ exists as relatively air stable, colorless crystals at room temperature. It dissolves in non-polar organic solvents such as benzene and diethyl ether.