This chapter explores how tools from discourse analysis can contribute to our understanding of digital surveillance. It lays the groundwork for this exploration by first examining the role of discourse analysis in our understanding of surveillance more generally. It then goes on to discuss the mediated nature of all surveillance and the different affordances and constraints that different media bring to it. Next, it provides an overview of the main discursive processes involved in digital surveillance, including participation, pretexting, entextualization, recontextualization and inferencing, showing how they occur differently when mediated through digital technologies. A range of key issues and ongoing debates around digital surveillance related to discourse analysis are then identified and elaborated upon, specifically identity, agency and power. Finally, the chapter discusses the implications of a discourse analytical approach to digital surveillance for the professional practices of applied and sociolinguists and suggests some future directions for research on discourse and digital surveillance.