In this article we show that theories and methods from psychology are valuable for public administration scholars and practitioners. We advocate the development of an interdisciplinary approach entitled ‘Behavioral Public Administration’. It is not the intention that Behavioral Public Administration replaces traditional public administration research. It is an addition. We start with an analysis of the background of Behavioral Public Administration research via a historical overview of the work of Herbert Simon among others. After that, we demonstrate that Behavioral Public Administration can be valuable (a) to test public administration theories and refine these; (b) to encourage methodological sophistication of public administration research; and (c) to improve the interaction between science and practice. We hope that this article contributes to a fruitful conversation that leads to a scientific and practical research area where public administration scholars and psychologists work together and learn from each other.