To cope with ongoing change, an increasing number of companies view agile approaches as fundamental for remaining competitive in dynamic environments. However, realizing the outcomes associated with agility requires not only the implementation of agile practices but also employees who possess an agile mindset. Although scholarly understanding of the agile mindset has increased in recent years, a validated measurement instrument for individuals is still lacking. This paper addresses this research gap by following the validation procedure proposed by MacKenzie, Podsakoff, Podsakoff [1]. Based on a systematic review of existing conceptualizations of the agile mindset, we empirically developed a scale and specified a corresponding measurement model. To quantitatively evaluate and validate the model, we analyzed data from four independent samples (content validity: n = 184; pretest: n = 500; validation: n = 202; cross-validation: n = 218). As a result, we validate a four-dimensional conceptualization of the agile mindset comprising the attitude toward learning, collaborative exchange, empowered self-guidance, and customer co-creation. Furthermore, we demonstrate that the agile mindset is correlated with key individual outcomes: job satisfaction, goal orientation, and reduced resistance to change and thereby reinforcing its relevance. In addition to its theoretical contribution, this study provides practical value by offering an economically efficient instrument for measuring the agile mindset.