There are distinct characteristics to the ways and procedures through which public administrations typically accomplish their daily tasks. The informal routines that characterize the behavior and activities of public administrations in the policymaking process are called administrative styles. They can be understood as the meso-level of organizational culture. Studying administrative styles is important for comparative research on policymaking because they capture and explain variance in policymaking and implementation beyond merely structural aspects or formal institutions. Similar to policy styles and regulatory styles, the concept of administrative styles has long been employed to describe state–society relationships. It has found to be a useful independent variable in the study various phenomena, such as divergent policy developments across European states, national idiosyncrasies in regulatory regimes or the impact of Europeanization on national administrations. However, administrative styles can also be informative of the relationship between the bureaucracy with both their political masters and society and bureaucratic influence in policymaking. In this regard, one can distinguish two orientations underpinning administrative styles, namely positional and functional orientations characterizing informal bureaucratic routines and standard operating procedures. Depending on the prevalence of positional and functional orientations in behavioral patterns, it is possible to distinguish four ideal-typical administrative styles that apply to administrative routines of influencing the policymaking process: a servant style, an advocacy style, a consolidator style, and an entrepreneurial style. Variation in administrative styles across different organizations can be explained by two factors, namely the internal and external challenges they face. Understood this way, administrative styles could enable a comparative assessment of bureaucratic routines and influence in policymaking across different countries or sectors as well as in supra- and international bureaucracies.