Inspired by Michel Foucault's interrogation of the practices, logic, and technologies of governance – which form what he calls "governmentality" – this dissertation argues that Luxembourg's banking-secrecy laws and domestic political consensus have led to the dramatic growth of the country's offshore financial center since the 1960s. Secrecy and consensus – central aspects of what I formulate as "offshore governmentality" – characterize the strategies of Luxembourg's state and finance elites as they develop new markets, navigate changing political circumstances, and mitigate risks posed to their niches. Furthermore, I posit that a "state-finance complex" of elite actors in Luxembourg carries out "offshore governmentality." Proceeding from this theoretical scope, I demonstrate how a governmentality of secrecy and consensus has enabled Luxembourg's "state-finance complex" to specialize in private banking, investment-fund administration, and art finance. I base my analysis of these three niches on data collected from media and archival sources, as well as from 80-plus interviews and participant-observation carried out with state and finance elites in Luxembourg. I also address this study's methodological implications and formulate a research platform – which I call "networking ethnography" – for social scientists to use in other elite contexts akin to the Luxembourg financial center. I conclude my dissertation on an interpretive note, making a conceptual linkage between the figures of the banker and the priest. The 1981 banking-secrecy laws were premised on a statute from Luxembourg's nineteenth-century criminal code, which implies that a priest cannot divulge any information that he has heard from a confessing parishioner. During my fieldwork, I was told on a consistent basis that one of the main reasons for the growth of offshore finance was so that clients could hide money from their spouses, ex-spouses, and children. Thus, I draw a conceptual parallel between the banker and the priest, both of whom learn about ...