姜-泰勒效应（英文：Jahn-Teller effect，简称JTE），有时也被称为姜-泰勒变形，描述了基态时有多个简并态的非线性分子的电子云在某些情形下发生的构型形变。分子发生几何构型畸变的目的是降低简并度，从而稳定其中一个状态。姜-泰勒效应主要出现在金属的配合物中，特别是某些金属染料的着色过程。

为了消除简并，八面体配合物将会沿着轴向（也就是z轴）扭曲。这一现象发生在有d轨域的金属络合物中。而简并性是在电子占据不同简并的轨道却可能有相同或相近的能量时产生。

配体的作用类似路易斯碱，可以给金属提供电子，过渡金属通过d轨道和配体发生相互作用形成含d轨道的金属配合物。八面体配合物中，6个M－L键的长度相等。

The Jahn–Teller effect, sometimes also known as Jahn–Teller distortion, describes the geometrical distortion of molecules and ions that is associated with certain electron configurations. This electronic effect is named after Hermann Arthur Jahn and Edward Teller, who proved, using group theory, that orbital nonlinear spatially degenerate molecules cannot be stable. The Jahn–Teller theorem essentially states that any nonlinear molecule with a spatially degenerate electronic ground state will undergo a geometrical distortion that removes that degeneracy, because the distortion lowers the overall energy of the species. For a description of another type of geometrical distortion that occurs in crystals with substitutional impurities see article off-center ions.