Despite widespread concern about levels of administrative burden within universities, understanding of the associated dimensions and drivers remains limited. Addressing the resulting lacuna, this paper presents a granular analysis of what academic staff within one national university system regard as the key dimensions and specific drivers of the administrative burdens they encounter at work. The data underlying our analyses are drawn from responses to an in-depth survey on administrative workloads from 350 academic staff working at 37 Australian universities. Our findings reveal that while generic administrative responsibilities add administrative burden, such burden is perhaps most acutely felt in the core academic work domains of teaching and research. In terms of perceptions of drivers, we find that two major strategies that universities have pursued to gain efficiencies—administrative centralization and administrative service automation—have resulted in what is widely experienced by academic staff as an intensification of their administrative burden.