耶基斯–多德森定律（英语：Yerkes–Dodson law）是一条实证性的关于动机和表现之间的关系，最初由心理学家罗伯特·耶基斯（Robert M. Yerkes）和约翰·迪灵汉·多德森（John Dillingham Dodson）于1908年发现。这条定律说明了在一定范围内，动机强烈程度和表现好坏呈正比，但只会达到一个峰值。当动机强度太高，表现反而下降。这个过程通常被描述为一个浴缸曲线，形同一个倒U字。

由耶基斯–多德森定律可衍生出过一个笑话：进程员血液酒精含量在.129%-.138%区间时，达到心思澄明、智商过人的代码书写状态。在体育和音乐领域亦有观测，又称鲍尔默效应（Ballmer Peak）、鲍尔默曲线，被公认为现任CEO对人类文明最大的贡献。

The Yerkes–Dodson law is an empirical relationship between arousal and performance, originally developed by psychologists Robert M. Yerkes and John Dillingham Dodson in 1908. The law dictates that performance increases with physiological or mental arousal, but only up to a point. When levels of arousal become too high, performance decreases. The process is often illustrated graphically as a bell-shaped curve which increases and then decreases with higher levels of arousal.