Islam is the fastest growing faith in the Republic of Ireland, with the number of adherents reported in 2012 at 50,000. However, despite this number there are only three Muslim primary schools. Empirical research on Muslim schools in Ireland is currently very limited. This article aims to provide insight and understanding into the role of ethos as a lived experience among children in Muslim primary schools in contemporary twenty-first century Ireland. The data for this ethnographic study were based on observations and interviews with Muslim parents and religion teachers in two Muslim Irish state-funded schools. This study revealed both similarities and variations between the schools, despite being under the same patronage. These were significantly notable in how the ethos was manifested and experienced by Muslim pupils, in terms of prayer, dress code and physical environment. The article concludes with some implications for the research.