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.
It is believed that the name 'Ros Muc' comes from the old Irish "the peninsula of rounded hills", ros meaning "peninsula" and muc meaning "rounded hills" or "Pig". Alternatively, the etymology could literally be ros muc—"the pig's head peninsula" (communication by boat between the area and neighbouring islands in Ceantar na nOileán being common up until the early 20th century, and the appearance of the peninsula from the sea was said to resemble that of a pig's head).
The area has many literary figures, notably Irish revolutionary and education/language activist Patrick Pearse (Pádraig Mac Piarais) who had a summer residence there in the early 1900s (now a National Monument/Heritage Site open to the public), and who set many of his short stories in the area. Another writer was Pádraic Ó Conaire, who wrote a number of short stories partly set in the region, including M'asal Beag Dubh (My Little Black Donkey) and the novella Deoraíocht (Exile). The area is recognized as one of the strongest remaining Gaeltacht areas in South Connemara.
Pádraig Pearse, who was involved in the 1916 revolution in Dublin had a cottage in Rosmuc where he wrote many of his pieces. It was in Rosmuc that he wrote his famous oration given at the grave of Ó Donnabháin Rosa (O'Donovan Rossa) in 1915, which included the immortal words " ... but, the fools, the fools, the fools! — They have left us our Fenian dead, and while Ireland holds these graves, Ireland unfree shall never be at peace."
Based in Rosmuc is Cumann Sacar Naomh Briocain (affiliated with the FAI and playing in the Galway district league) Naomh Briocain also has players from neighbouring parishes, most notably Cill Chairain, Carna and Letir Mor.
Rosmuc along with its neighbours Camus and An Sraith Salach have a GAA Football between them called Na Piarsaigh.
Rosmuc has had a long term relationship with Coláiste na bhFiann as it provides host accommodation for students learning Irish during the summer months.
Town Lands in Rosmuc Gleann Chatha, An Gort Mór, Inbhear, Turlach, Ros Dubh, An Tamhnaigh Bhig, Snámh Bó, Cill Bhriocáin, An Aill Bhuí, An tOileán Mór, An Turlach Beag, Salalaoi, An Baile Thair, An Siléar, Inis Eilte, An Cladhnach, Cladach ó Dheas, Gairfean, Ros Cíde, Doire Iorrais