Rosmuc or Ros Muc (formerly anglicised as Rosmuck) is a village in the heart of the Conamara Gaeltacht of County Galway, Ireland. It lies halfway between the town of Clifden and the city of Galway. It is estimated that people first settled in Rosmuc in 400, one hundred years before Naomh Briocán (Saint Briocán) brought Christianity to the area. That is to say that there are people that have been in Rosmuc for one thousand five hundred years. Irish is the predominantly spoken language. The District Electoral Division of Turlough, Rosmuc, state that Rosmuc is the most strongly Irish-speaking area in the country. According to an analysis of the census a total of 91.9% of adults over nineteen years old said they spoke Irish on a daily basis. The population of Rosmuc is estimated to be around five hundred people. For the past thirty years there has been a decline in the population, this is mainly due to emigration, although the tide of emigration has subsided in recent years due to the robust nature of the Irish economy. The village is the birthplace of a former president of the Gaelic League, Proinsias Mac Aonghusa.