States use proxies to project power through cyberspace, some capable of causing significant harm. In recent years, media outlets have published reports about proxies using Information and Communications Technologies (ICTs) from Northeast Asia to India, Pakistan, the Middle East, and Eastern Europe. Two of the landmark documents providing insight into how the international community thinks about rules of the road for cyberspace explicitly reference the term ‘proxies’. However, neither report defines ‘proxy’, nor does the term easily translate into non-English languages. This article therefore reviews what this term means and how it has been used in various contexts. It focuses on the subset of proxies that are non-state actors used by a state actor, analysing the different logical distinctions and levels of detachment between a state and a non-state actor’s activity. The goal is 2-fold: first, to provide a framework to think about the diverse array of existing proxy definitions; second, to conceptualise the relationships between a state and non-state proxies that can offer a guide for political decision-makers and a roadmap for future research on proxy actors and cyberspace.