<p>Legitimacy is a widely studied concept in institutional research and is considered crucial for occupations and other social entities to access resources. Whereas traditional professions derive their legitimacy from well-established professionalization processes, emerging corporate professions—for example in human resource management, project management, consulting, or sustainability—illustrate a shift away from these conventional foundations. This shift highlights the need to examine how legitimacy is constructed and maintained in evolving occupational landscapes. Despite extensive research on legitimacy, developing measurement instruments poses various challenges for researchers, including issues related to the level and type of judgment. Therefore, we aim to develop a scale to measure corporate profession legitimacy at the micro level that considers the multidimensionality of legitimacy. We conceptualized corporate profession legitimacy as a second-order formative construct of three unique legitimacy dimensions: instrumental, social, and technical. The results of the scale development process largely support the validity of the corporate profession legitimacy construct, providing a robust instrument for assessing the legitimization process of a corporate profession, facilitating evaluations of legitimacy strategies, and revealing nuanced insights on legitimacy-seeking corporate professions.</p>