The 2nd edition of the Routledge Handbook of Security Studies has just been published. The 41 chapters give an overview of the stat of the art of Security Studies, discuss theoretical approaches, as well as distinct security challenges. In my contribution to the handbook, titled “Security as Practice”, I introduce and discuss how practice theories have been developed within the sub-discipline. I pay particular attention to theories developed from Bourdieu’s work, the security communities of practice approach, as well as relationalist and actor-network theory inspired work. The pre-print of the chapter is available via my academia page.