This article draws on long-term fieldwork among Slovak Roma migrants, identifying processes through which a haunting figure of the Roma migrant emerges across Europe, to argue for more differentiated accounts of continuing and emerging forms of racialisation. It explores how the movement of Roma (whose bodies are marked by their racialised 'darkness' in Slovakia) to Britain granted them a temporary escape from this modality of branding while simultaneously exposing them to different categorisations within a re-configuring classificatory matrix. The article develops the concept of 'migrating racialisation' in order to empirically trace how historically developed forms of racialisation in Slovakia migrate across Europe through the movement of Roma and non-Roma migrants from Eastern Europe, as well as through particular forms of knowledge circulating within transnational fields constituted not only by Roma migrants themselves but also by various institutions for 'managing' or 'researching' 'the Roma'. This concept allows us to analyse how the recent forms of racialisation simultaneously draw on heterogenous histories and nation-state formations, social conditions and sedimented bodily dispositions, which are re-adjusted to new social conditions, discourses and emerging forms of knowledge produced about Roma migrants over the last decade in British and European contexts.