Ó Mulláin, Dónall (1880–1965), traditional Irish singer, was born 1 February 1880 in Scrahan, Cúil Aodha, Co. Cork, one of seven children of stonemason Seán Ó Mulláin and his wife, Síle Ní Laoghaire. An uncle of the Irish-language authors Síle Ní Chéileachair (qv) and Donncha Ó Céileachair (qv), he was a gifted violin and concertina musician, singer, songwriter, inheriting these talents from both his parents. He is reported to have been an excellent dancer, having learned the steps from his father who himself had learned them from the old masters. It is said that he danced a hornpipe for Seán Ó Riada (qv) on his kitchen floor a couple of weeks before he died.
Ó Mulláin was involved in Dámhscoil Mhúscraí from its foundation on 26 December 1925. He wrote songs on many different topics including national and international current affairs or an amusing story he had heard. Many of his songs became popular amongst Irish speakers, his best known being ‘An puc ar buille’, which he composed in 1940. A song with the same title and tune had existed prior to this but Ó Mulláin's version replaced it. He regularly attended oireachtas na Gaeilge and won a prize in the singing competition with this song. It later reached a wider audience when it was recorded by Seán Ó Sé. Other well-known songs of Ó Mulláin's include: ‘Amhrán na tae’, ‘An chráin mhuice’, ‘Amhrán an bhacaigh’, ‘Halla Chúil Aodha’, ‘Na táilliúirí’, ‘An sputnic’ and ‘An cailín donn’.
Although he learned his father's trade, he spent his life as a farmer and worked on his farm until the day he died.
He married Siobhán Ní Thuama from Cill Gharbháin, Co. Kerry and they had three sons and three daughters. His son Seán Ó Mulláin was an Irish language author and published the following works: An dubhchrónach (1953), Dealg Eochaidh (1969), Na rianaigh abú (1970), Cosaint an ghleanna (1972) and Fir chlaímh (1976).
Ó Mulláin died at his home 12 January 1965 and is interred in St Gobnait's cemetery, Cúil Aodh.