The theory of administrative traditions simplifies the idea of path-dependent administrative behavior, and facilitates organized cross-country comparisons of administrative institutions. Yet, many nations exhibit mixed or hybrid administrative structures, shaped by legacies from administrative solutions in multiple past regimes and ethnic divisions, which continue to influence modern bureaucracies. In response to this, we introduce a new data collection encompassing administrative hybridity worldwide, capturing its dynamic nature and fundamental attributes of public administration. Furthermore, we explore how these data can shed light on the success and failure of state performance. This paper thus seeks to provide a fresh and rigorous global classification of administrative hybridity while illustrating how this variable can exert significant implications for contemporary administrative politics.