The Orthodox is the fastest growing religious grouping in Ireland according to the 2011 census, showing a growth rate of 117% since 2006. According to the official record, in 1991 there were just 358 Orthodox in Ireland, by 2011 this had grown to 45,223. This paper will briefly survey the history of Orthodoxy in 20th century Ireland and chart the course of this dramatic rise in numbers before addressing the question of the role and agency of local “converts” to Orthodoxy both as mediators of the local context and innovators within Irish Orthodoxy. Although the exponential rise in the number of Orthodox Christians is the result of mass labour migration, I argue here that the construction of Orthodox space in Ireland, both physical and conceptual, has been profoundly shaped by the agency of local “converts.”